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Other => CPU/GPU Bitcoin mining hardware => Topic started by: crazybernie on June 27, 2011, 01:10:47 PM



Title: Yet Another Video Card Comparison...
Post by: crazybernie on June 27, 2011, 01:10:47 PM
***EDIT*** Revised chart to include "Stock"  vs "Tweaked" results and show the possible gains to be had.

http://img703.imageshack.us/img703/7876/vidcardbtccmpv2.jpg

Notes:

- The MHash performance and wattages are an average of the values from the Wiki site (https://en.bitcoin.it/wiki/Mining_hardware_comparison).  There were a few cards that I pulled wattage information from other sources due to not being listed on the Wiki.  So don't be too surprised if your card does not perform as well as these averages at stock speeds.

- I did not list cards that were no longer/not currently available with two exceptions: the 5830 and the 6990.  Nobody has the 5830 available for a "reasonable price," and nobody has the 6990 available.  I didn't include eBay for these availability considerations (although you can get used 5830's there for about what I listed it for), or the large number of Google/Pricewatch shopping vendors that I consider to have questionable reputability.  YMMV.

- I pulled the majority of prices from Newegg and Tiger Direct.  I did not include prices for tax, shipping, or rebates.

- The 5770 still has the best overall performance for a combination of power consumption and price.  Newegg has a 5770 for $89.99 after rebate, making it an even better deal.  Get 'em while they're still available... the rebate is only good till 6/30, and unlike most rebates, it's good for two cards per household.  The 6870 makes a solid second place choice, but I'd probably recommend spending extra on the 6950 if you're going multi GPU and looking to maximize your performance vs space.  Of course the 6970's and 5870's are still kicking around for the brute-force-money-is-no-object fellows... ^_^

***POST REVISION***

- I've taken the averages of the lowest two scores to use as the "Stock" performance numbers.  This can account for some variance between cards that come tweaked from the manufacturer as well as different settings/mining apps.

- I've taken the averages of the highest two scores to use as the "Tweaked" performance numbers, to be used as theoretical gains.

- With these revisions, the 6950 is painted in an even more favorable light when you factor in the possibility of unlocking dormant shaders and overclocking.  The 6970 also rises to the occasion with great performance vs power consumption if you don't mind the higher entry cost.  Older cards like the 5830/5870 offer great performance/watt but are unfortunately held back by pricing and availability of these discontinued parts.  Buying second hand is a mixed bag, as people generally want more than the cards are worth (eg, people asking for $200+ for 5830's).


Thoughts?


Title: Re: Yet Another Video Card Comparison...
Post by: Jack of Diamonds on June 27, 2011, 02:41:10 PM
6990 is off by a wide margin.
For 760+ mhash/s you would have to OC past 900mhz so power consumption just for the card itself will be 450-500+ watts


Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on June 27, 2011, 03:07:02 PM
Well I was averaging the scores, and people conveniently refrained from posting their wattage consumption... >.<

The 6990 is generally for those unconcerned with price/power consumption.  Even with an adjusted power consumption though, it's still a relatively good performance/power card (@ 450 watts, it would score a 1.69 MHash/j).  There's also the matter of availability, or lack thereof.


Title: Re: Yet Another Video Card Comparison...
Post by: Synaesthesia on June 27, 2011, 03:14:07 PM
The scores on the Wiki tend to be very high. Eg I get 250Mhashes a sec on a 5830 OC'ed to 925mhz. You'd have to OC even higher to get 285 (the score for a 5830). For a stock 5830 it's ~220Mhashes or so.


Title: Re: Yet Another Video Card Comparison...
Post by: Reckman on June 27, 2011, 04:50:36 PM
5850 Probably the best card for mining back when they were 150


Title: Re: Yet Another Video Card Comparison...
Post by: fcmatt on June 27, 2011, 05:43:33 PM
one has to be careful comparing reference cards to non-ref.
lets use the 6950 as an example. the 6950 can have the shaders unlocked. it can
be overclocked/overvolted to get an easy 420+ mh/s.

so your chart has a lot of problems to someone who studies these card variances in
depth. spending some time understanding why some cards do so much better then other
cards in the same type is the key to getting extra out of them.



Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on June 27, 2011, 06:57:39 PM
Fair enough... how about this revised comparison?

*** Image moved to first post ***

- I've taken the averages of the lowest two scores to use as the "Stock" performance numbers.  This can account for some variance between cards that come tweaked from the manufacturer as well as different settings/mining apps.

- I've taken the averages of the highest two scores to use as the "Tweaked" performance numbers, to be used as theoretical gains.

- I didn't touch the wattage figures for now... there's too large an amount of unrecorded figures.  I might do a search for some stock wattages later.


Title: Re: Yet Another Video Card Comparison...
Post by: Synaesthesia on June 27, 2011, 07:07:59 PM
You're quite correct that the 5770 is the best deal going right now. But even better is 2nd hand cards.


Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on June 27, 2011, 08:13:20 PM
Second hand cards are very hit and miss... people who know about bitcoins are asking a lot more than they're worth and as a result everyone else is asking for more.  I did however hook a buddy of mine up on a used 5830 for $115 through Amazon.


Title: Re: Yet Another Video Card Comparison...
Post by: fcmatt on June 27, 2011, 08:52:22 PM
You're quite correct that the 5770 is the best deal going right now. But even better is 2nd hand cards.

i have not done the math but i have to wonder if the price of buying psu/MB/ram/proc/etc... outweighs
their apparent value.

now the 5830 on the other hand for the same price or slightly more had enough mh/s per card to offset
those costs easily.


Title: Re: Yet Another Video Card Comparison...
Post by: kookiekrak on June 27, 2011, 08:53:29 PM
your 5870 price is off.

its about 300$ for the 1gb version, 550$ for the 2gb version.  both produce the same amount of hashes


Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on June 27, 2011, 09:17:42 PM
The key to the prices was finding the card in stock at a reputable vendor.  That is why I used TigerDirect and Newegg for my price/availability checks.  Doing some extra searching, I did find a 1GB 5870 from a vendor with some positive ratings that claims to have the card in stock for $419.99.  Everyone else lists it as a special order or out of stock item.  Considering it's a discontinued item, good luck getting any "Special orders."

Of course, you could always take your chances and buy a used one for only $249 from bobbyh (http://www.amazon.com/gp/offer-listing/B002Q6Z8TE/ref=dp_olp_used?ie=UTF8&qid=1309209252&sr=8-10&condition=used)!  ;D


Title: Re: Yet Another Video Card Comparison...
Post by: gigica viteazu` on June 27, 2011, 10:39:39 PM
so i better get 2x 6950 than 2x 5870 ? does the brand count ?

tkx


Title: Re: Yet Another Video Card Comparison...
Post by: fcmatt on June 27, 2011, 11:06:06 PM
so i better get 2x 6950 than 2x 5870 ? does the brand count ?

tkx

when it comes to 6950s it is not the brand that counts as much as the design. when buying
a 6950 for mining you want a reference card. that is a card that AMD designed and manufacturers
copied pretty much exactly. it is those cards which can have the extra shaders unlocked and thus
improve performance. they also overclock well and you can control the voltage. plus they have
a dual bios in case you screw up the card you can revert it back.

hope that helps.


Title: Re: Yet Another Video Card Comparison...
Post by: BiggieJohn on June 27, 2011, 11:28:20 PM
so i better get 2x 6950 than 2x 5870 ? does the brand count ?

tkx

when it comes to 6950s it is not the brand that counts as much as the design. when buying
a 6950 for mining you want a reference card. that is a card that AMD designed and manufacturers
copied pretty much exactly. it is those cards which can have the extra shaders unlocked and thus
improve performance. they also overclock well and you can control the voltage. plus they have
a dual bios in case you screw up the card you can revert it back.

hope that helps.

Any tips on how to tell if it's reference card or not ???


Title: Re: Yet Another Video Card Comparison...
Post by: gigica viteazu` on June 27, 2011, 11:35:01 PM

Any tips on how to tell if it's reference card or not ???

this is reference design with the fan at the back

http://www.theitwares.com/images/Sapphire_6950_2.JPG


Title: Re: Yet Another Video Card Comparison...
Post by: Mousepotato on June 27, 2011, 11:52:04 PM

Not sure if this is a good buy at $270 after MIR...


Title: Re: Yet Another Video Card Comparison...
Post by: jollyjim on June 28, 2011, 09:48:12 AM
6990 is off by a wide margin.
For 760+ mhash/s you would have to OC past 900mhz so power consumption just for the card itself will be 450-500+ watts

That's not true.  At 880mhz, I'm getting 379.8 mhash/s for each core (759.6 mhash/s for the card).  With finely tuned over/underclocking, I was able to get 3x6990 to do a stable 2.41 ghash/s in under 1300w for the entire system (efficiency of 1.85 mhash/J for the entire system, 2.00+ mhash/J for each card).  I'd guess the system w/o the GPUs is around 100-150w, which means each card is doing about 400w, maybe less.  I can overclock them even higher as well but I wanted to keep the system at safer amperage levels.  This was before software tweaks I made that pushed it 3.5-4.0% faster (3% of it thanks to bitless's Ma optimization).  I don't know how much power they use now but they're doing 2.50 ghash/s now.  I don't think power has changed too much since temps are about the same as before (all but a "defective" core are below 80C on air cooling).  I still have plenty of room to get it even faster but I'll be losing a lot of efficiency in the process and I'll be over the power usage constraint I placed upon myself for the whole 3 card system.

On the other end of the spectrum, I can tweak the system to be at least as efficient as 2.10 mhash/J (or over 2.35 for the card) while still maintaining a hash rate above 2.0 ghash/s.  I'm sure all the efficiency numbers are even higher now with the 3+% speedup.  The PSUs and GPUs matter quite a bit at the higher OC levels.  I've seen GPU cores that require a lot more voltage to achieve the same rate as another one.  And if you're unlucky (like me), you'll get a card with cores that are well over 10C higher than the other core on the same card, making it so you can't overclock as much while using up more power due to the extra heat.

I run Linux and use the phoenix miner with the poclbm kernel.  It's the fastest miner for me and beats even hashkill in raw speed while having less than 1% stales.  My numbers are now higher than hdminer now (@915, I get 817 mhash/s vs hdminer's 802. @960, I get 857 mhash/s vs 840).  I think my hardware tweaks put them over the top, as the software tweaks haven't quite reached the 6.4% hdminer claims so I'd be interested in finding out if hdminer would get even better numbers with my setup.  I'm just not willing to pay the hefty price to find out.


Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on June 28, 2011, 01:41:53 PM

If it was for gaming, I'd say no, unlocking the bios wouldn't get you much by way of performance gains.  For bitcoin mining, it's a much better value.  Those extra shaders can make a nice bonus for only $30 more, instead of paying $100 more for a 6970.  Plus, if you're overclocking, that bios switch could be a godsend.


Title: Re: Yet Another Video Card Comparison...
Post by: trueimage on June 28, 2011, 03:40:18 PM
5830 "tweaked" at 318 Mhash/s? How, exactly? water cooling + 50% overclock?


Title: Re: Yet Another Video Card Comparison...
Post by: gigica viteazu` on June 28, 2011, 03:54:36 PM
5830 "tweaked" at 318 Mhash/s? How, exactly? water cooling + 50% overclock?

on air with AC on the server room
http://dl.dropbox.com/u/3653118/5830proof.png


Title: Re: Yet Another Video Card Comparison...
Post by: film2240 on June 28, 2011, 06:28:31 PM
***EDIT*** Revised chart to include "Stock"  vs "Tweaked" results and show the possible gains to be had.

http://img703.imageshack.us/img703/7876/vidcardbtccmpv2.jpg

Notes:

- The MHash performance and wattages are an average of the values from the Wiki site (https://en.bitcoin.it/wiki/Mining_hardware_comparison).  There were a few cards that I pulled wattage information from other sources due to not being listed on the Wiki.  So don't be too surprised if your card does not perform as well as these averages at stock speeds.

- I did not list cards that were no longer/not currently available with two exceptions: the 5830 and the 6990.  Nobody has the 5830 available for a "reasonable price," and nobody has the 6990 available.  I didn't include eBay for these availability considerations (although you can get used 5830's there for about what I listed it for), or the large number of Google/Pricewatch shopping vendors that I consider to have questionable reputability.  YMMV.

- I pulled the majority of prices from Newegg and Tiger Direct.  I did not include prices for tax, shipping, or rebates.

- The 5770 still has the best overall performance for a combination of power consumption and price.  Newegg has a 5770 for $89.99 after rebate, making it an even better deal.  Get 'em while they're still available... the rebate is only good till 6/30, and unlike most rebates, it's good for two cards per household.  The 6870 makes a solid second place choice, but I'd probably recommend spending extra on the 6950 if you're going multi GPU and looking to maximize your performance vs space.  Of course the 6970's and 5870's are still kicking around for the brute-force-money-is-no-object fellows... ^_^

***POST REVISION***

- I've taken the averages of the lowest two scores to use as the "Stock" performance numbers.  This can account for some variance between cards that come tweaked from the manufacturer as well as different settings/mining apps.

- I've taken the averages of the highest two scores to use as the "Tweaked" performance numbers, to be used as theoretical gains.

- With these revisions, the 6950 is painted in an even more favorable light when you factor in the possibility of unlocking dormant shaders and overclocking.  The 6970 also rises to the occasion with great performance vs power consumption if you don't mind the higher entry cost.  Older cards like the 5830/5870 offer great performance/watt but are unfortunately held back by pricing and availability of these discontinued parts.  Buying second hand is a mixed bag, as people generally want more than the cards are worth (eg, people asking for $200+ for 5830's).


Thoughts?

Glad to know that my HD4670 GPU can do much better than wot I'm getting which is 34MHash/s even when OC'd to the max in Catalyst which is disappointing.I do wonder if there's ny point in mining though now,cus the difficulty has risen so much that it would remain unviable for me to run my MBP mid 2010 notebook with my PC as well combined ina  pool even.

Why does difficulty rise so much every few days?is this by design?or is something wrong with my systems? To make matters worse 4 me is I'm having no luck finding HD 6950 GPUs that are unlockable still on the shelves in Uk now as cus I'm left with VTX3D GPUs as known to be unlockable but they brick rather easily as I've found out,can't remember the source tho.So it's either stop mining for me completely or take a gamble and buy locked HD 6950.I need advice on wot to do,cus I found these 2 cards:
1.http://www.pixmania.co.uk/uk/uk/837172.79/art/sapphire-technology/radeon-hd-6950-2-gb-gddr5.html
2.http://www.pixmania.co.uk/uk/uk/8766002/art/pixmania/radeon-hd-6950-2-gb-gddr5.html#

Are these unlockable and do u know wot BIOS file i can use for that 2nd card?As it isn't branded like sapphire or XFX cards?


I plan to order 1 very soon but I rly need the advice b4 doing so.
Thanks


Title: Re: Yet Another Video Card Comparison...
Post by: Mousepotato on June 28, 2011, 06:57:46 PM
5830 "tweaked" at 318 Mhash/s? How, exactly? water cooling + 50% overclock?
I don't understand how people are having problems hitting this with their 5830s.  I simply opened the box on mine, set the core/memory clocks in AMD GPU Clock Tool, set fan speed in MSI Afterburner, then started my miner with some parameters found in the HW wiki and it immediately hit 316 MH/s. Did I just get lucky?


Title: Re: Yet Another Video Card Comparison...
Post by: BkkCoins on June 28, 2011, 07:24:00 PM
Excellent chart. Thanks for that.

I'd like to pick up a couple 5770.
Do I need to look for reference design or unlockable specs?
Will any mfr. do fine? I've seen Asus, Saphire, HIS, XFX. All good?
Thanks!


Title: Re: Yet Another Video Card Comparison...
Post by: fcmatt on June 28, 2011, 07:29:49 PM
5830 "tweaked" at 318 Mhash/s? How, exactly? water cooling + 50% overclock?
I don't understand how people are having problems hitting this with their 5830s.  I simply opened the box on mine, set the core/memory clocks in AMD GPU Clock Tool, set fan speed in MSI Afterburner, then started my miner with some parameters found in the HW wiki and it immediately hit 316 MH/s. Did I just get lucky?

getting 316 is very good. you got a card that is very stable at such a clock speed.
a more reasonable speed for almost every 5830 would be ~300 mh/s at a clock speed of 980.
so it seems you are pushing yours a tad faster then the majority and if the thing runs without
crashing in a few minutes/hours more power to you.

also your choice of mining software plays a role. phatk is the way to go versus others.


Title: Re: Yet Another Video Card Comparison...
Post by: SlipperySlope on June 29, 2011, 03:04:58 AM
Excellent chart. Thanks for that.

I'd like to pick up a couple 5770.
Do I need to look for reference design or unlockable specs?
Will any mfr. do fine? I've seen Asus, Saphire, HIS, XFX. All good?
Thanks!

I found that Sapphire 5770 GPUs have better fans and heatpipes that keep the temperature about 10 C cooler than alternatives.


Title: Re: Yet Another Video Card Comparison...
Post by: BkkCoins on June 29, 2011, 04:12:08 AM
I found that Sapphire 5770 GPUs have better fans and heatpipes that keep the temperature about 10 C cooler than alternatives.

Thank You.

I'll look for those ones then. Just needed some way to differentiate. You didn't need to select special versions like reference ones or anything? I would just order them online so whatever comes is what I get. I guess that's what most buyers do anyway.


Title: Re: Yet Another Video Card Comparison...
Post by: film2240 on June 29, 2011, 09:37:40 AM
I found that Sapphire 5770 GPUs have better fans and heatpipes that keep the temperature about 10 C cooler than alternatives.

Thank You.

I'll look for those ones then. Just needed some way to differentiate. You didn't need to select special versions like reference ones or anything? I would just order them online so whatever comes is what I get. I guess that's what most buyers do anyway.

A way to look for reference cards is to look for the AMD logo neat the PCI-E connector (the bit that goes into your mobo) I hear.I hope this helps.

I'm buying the last easy to get stock of Radeon Hd 96950s with reference board as pictured.I hope this is still reference,in UK.The easy to get stock is 178.50 for that gpu from pixmania,so if ny1 still wants what looks like an unlockable card,please go for it b4 they restock with permanently 'locked' cards,if u r looking for a radeon HD 6950 card that is.

Does this look like an unlockable card to u guys?http://www.pixmania.co.uk/uk/uk/8766002/art/pixmania/radeon-hd-6950-2-gb-gddr5.html

Plz advise me on this.

After that stock is gone,you'll have to pay at least 220 or more to get that same card on reference in the pic.


Title: Re: Yet Another Video Card Comparison...
Post by: malevolent on June 29, 2011, 11:28:35 AM
HD 5850 is missing on the list.


Title: Re: Yet Another Video Card Comparison...
Post by: BkkCoins on June 29, 2011, 11:48:49 AM
A way to look for reference cards is to look for the AMD logo neat the PCI-E connector (the bit that goes into your mobo) I hear.I hope this helps.
Not much chance of doing that online. Call sales dept... ya, can you check if it has a AMD logo next to the... oh what, can't open the package? Because the warehouse is in Kentucky and you're in Bangalore?


Title: Re: Yet Another Video Card Comparison...
Post by: hoki on June 29, 2011, 12:53:17 PM
is the 6990 from the table single core?


Title: Re: Yet Another Video Card Comparison...
Post by: BkkCoins on June 29, 2011, 01:23:47 PM
is the 6990 from the table single core?
A 6990 has 2 GPUs.


Title: Re: Yet Another Video Card Comparison...
Post by: hoki on June 29, 2011, 01:34:43 PM
A 6990 has 2 GPUs.

How come it's only ~820 mhash/s then? According to this table it's at least 1,436 mhash/s - https://en.bitcoin.it/wiki/Mining_hardware_comparison (https://en.bitcoin.it/wiki/Mining_hardware_comparison)


Title: Re: Yet Another Video Card Comparison...
Post by: BkkCoins on June 29, 2011, 01:40:21 PM
A 6990 has 2 GPUs.

How come it's only ~820 mhash/s then? According to this table it's at least 1,436 mhash/s - https://en.bitcoin.it/wiki/Mining_hardware_comparison (https://en.bitcoin.it/wiki/Mining_hardware_comparison)
That table has both 6990 and 6990x2, meaning a system with 2 6990 cards in it.


Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on June 29, 2011, 01:57:21 PM
HD 5850 is missing on the list.

I didn't include it due to lack of availability and reliable pricing.  The few vendors that do have it are price gouging... or you can try your luck on ebay.


Title: Re: Yet Another Video Card Comparison...
Post by: hoki on June 29, 2011, 03:06:58 PM
That table has both 6990 and 6990x2, meaning a system with 2 6990 cards in it.

Yeah, but a 6990x2 card doesn't cost $1440, so I think the mhs/$$$ calculation is misleading.


Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on June 29, 2011, 03:33:16 PM
A 6990x2 is two SEPERATE video cards... it denotes someone using two 6990 video cards in Crossfire mode.  Just like a 6990x3 denotes someone using 3 6990 cards in Crossfire mode.

So @ $722 per card your total would in fact be $1444, not misleading in any way.  Keep in mind that the MH/s are averages based on user input, so YMMV.


Title: Re: Yet Another Video Card Comparison...
Post by: hoki on June 29, 2011, 04:02:25 PM
A 6990x2 is two SEPERATE video cards... it denotes someone using two 6990 video cards in Crossfire mode.  Just like a 6990x3 denotes someone using 3 6990 cards in Crossfire mode.

So @ $722 per card your total would in fact be $1444, not misleading in any way.  Keep in mind that the MH/s are averages based on user input, so YMMV.

Thanks for the clarification!


Title: Re: Yet Another Video Card Comparison...
Post by: malevolent on June 29, 2011, 04:25:10 PM
Yeah, I know, it took me some time to find them at a reasonable price in Europe. Found them in pixmania for 120. I should have them this week.


Title: Re: Yet Another Video Card Comparison...
Post by: BkkCoins on June 29, 2011, 04:35:24 PM
I think 5770s are the best value now on their own. To get a true valuation you would have to take into account how many cards per system as well. And add the system cost in that number of cards.

Higher speed cards gain back some of their higher cost with less system cost per same total GH/s.

That is, two systems total 4 x 5770 would be about 800 GH/s.
But with 6990s you can do that in one system. So you save the cost of a second system.


Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on June 29, 2011, 04:41:17 PM
A 6990x2 is two SEPERATE video cards... it denotes someone using two 6990 video cards in Crossfire mode.  Just like a 6990x3 denotes someone using 3 6990 cards in Crossfire mode.

So @ $722 per card your total would in fact be $1444, not misleading in any way.  Keep in mind that the MH/s are averages based on user input, so YMMV.

Thanks for the clarification!

It really depends on your usage model.  The 5770 is currently the best (readily) available performer when comparing power consumption and initial costs.  If you're looking for the most performance you can cram in the least available space and the up front money isn't a huge concern, go for something like the 6970.

Using the bitcoin profitability calculator (http://bitcoinx.com/profit/index.php) and just changing the hashrate, cost, and power use of the video cards (not including the rest of the PC costs/consumption), the 5770 @ stock shows a $1.67USD/day profit with a 66 day "break even" (the card paying for itself).  The 6970 shows a $3.44/Day profit with a 99 day "break even."  Of course these calculations don't account for the difficulty going up, but it shows that long term, the 6970 is the more profitable card.

Of course, a lot of us little guys can't be dumping $340 here and there, which is where a card like the 5770 shines.  We can only hope that video card manufacturers don't notice these values and adjust their profit margins accordingly.


Title: Re: Yet Another Video Card Comparison...
Post by: hoki on July 03, 2011, 02:46:34 PM
It really depends on your usage model.  The 5770 is currently the best (readily) available performer when comparing power consumption and initial costs.  If you're looking for the most performance you can cram in the least available space and the up front money isn't a huge concern, go for something like the 6970.

Using the bitcoin profitability calculator (http://bitcoinx.com/profit/index.php) and just changing the hashrate, cost, and power use of the video cards (not including the rest of the PC costs/consumption), the 5770 @ stock shows a $1.67USD/day profit with a 66 day "break even" (the card paying for itself).  The 6970 shows a $3.44/Day profit with a 99 day "break even."  Of course these calculations don't account for the difficulty going up, but it shows that long term, the 6970 is the more profitable card.

Of course, a lot of us little guys can't be dumping $340 here and there, which is where a card like the 5770 shines.  We can only hope that video card manufacturers don't notice these values and adjust their profit margins accordingly.

So, a 6990 would be a "no-go" in any case? What is it's profitability/day?


Title: Re: Yet Another Video Card Comparison...
Post by: Jack of Diamonds on July 04, 2011, 12:20:32 AM
That fluctuates based on difficulty. Currently a single 6990 produces about 0.58 bitcoins per day, or $9 dollars worth of them (at $15.5 exchange rate which also fluctuates).

At the next difficulty of about 1.6m, it will generate 0.50 BTC per day, or about $8 dollars daily.

Price would have to increase by quite a bit, or difficulty would have to stagnate, if you want it fully paid by mining.
It will pay itself off partially in the long run though, even after counting in electricity. Maybe even fully if price appreciates in the near future.


Title: Re: Yet Another Video Card Comparison...
Post by: crazybernie on July 05, 2011, 06:52:04 PM
For the 6990 @ $722, based on current rates ($14.5 @ Mt Gox) for a 6 month time period:

Revenue per day: 7.29 USD
       ... less power costs: 5.76 USD
 
Revenue per time frame: 1330.60 USD
       ... less power costs: 1051.18 USD
 
Hardware break even: 125 days, 10 hours
 Net profit first time frame: 329.18 USD