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Author Topic: Video Card  (Read 1779 times)
l33
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June 23, 2011, 11:48:04 AM
 #1

I have been looking around and I can not decide between these cards. If I want the best (raw power) card for Bitcoin...would it be the 6950. I am finding a lot of mixed reviews.

ATI 5850
ATI 5870
ATI 6950

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June 23, 2011, 11:51:27 AM
 #2

6990 for raw power. 5830 for cheap redundant power.

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l33
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June 23, 2011, 02:01:23 PM
 #3

Okay, so the 6990s are a $$$$. If i get one 6990, will it be better that 3 5850s?

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June 23, 2011, 02:26:54 PM
 #4

Have you tried this site?
https://en.bitcoin.it/wiki/Mining_hardware_comparison

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l33
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June 23, 2011, 02:40:11 PM
 #5

just found out about that site about 5 minutes ago. Thanks

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June 23, 2011, 03:08:38 PM
 #6

Although the poster expresses a preference for raw power, anyone else considering a new bitcoin mining rig should optimise three separate features...

1. maximum MH/sec per GPU card - fewer GPU cards mean fewer motherboards, CPUs, and power supplies, software configuration, and monitoring effort.

2. minimum purchase expense per card - with mining difficulty exponentially increasing due to exponential growth of total network hashrate, its possible that certain expensive mining rigs will not payback their purchase price after subtracting gains from selling off the used components later.

3. minimum power consumption per card - this ongoing cost determines the point at which bitcoin mining ultimately becomes unprofitable on a cash flow basis.  Lower power consumption per card makes it easier to cool the card and also to overclock it.

The Radeon HD 6990 is optimal only for criteria #1 above.  The owner of the famous 48 GH/sec mining rig featured on YouTube says that he is "upgrading" his vast number of 6990 cards with 5830s as he can obtain them.  Why?  Because of criteria #3 above.

I chose to construct my 1200 MH/sec rig using three case-less motherboards with two overclocked HD 5770 GPU cards each.  The HD 5770 cards were the most optimal for me using these criteria considering the limited choices at Newegg in the USA at the time of purchase.  The power drawn by the shared UPS is 850 watts.

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June 23, 2011, 04:32:10 PM
 #7

Although the poster expresses a preference for raw power, anyone else considering a new bitcoin mining rig should optimise three separate features...

1. maximum MH/sec per GPU card - fewer GPU cards mean fewer motherboards, CPUs, and power supplies, software configuration, and monitoring effort.

2. minimum purchase expense per card - with mining difficulty exponentially increasing due to exponential growth of total network hashrate, its possible that certain expensive mining rigs will not payback their purchase price after subtracting gains from selling off the used components later.

3. minimum power consumption per card - this ongoing cost determines the point at which bitcoin mining ultimately becomes unprofitable on a cash flow basis.  Lower power consumption per card makes it easier to cool the card and also to overclock it.

The Radeon HD 6990 is optimal only for criteria #1 above.  The owner of the famous 48 GH/sec mining rig featured on YouTube says that he is "upgrading" his vast number of 6990 cards with 5830s as he can obtain them.  Why?  Because of criteria #3 above.

I chose to construct my 1200 MH/sec rig using three case-less motherboards with two overclocked HD 5770 GPU cards each.  The HD 5770 cards were the most optimal for me using these criteria considering the limited choices at Newegg in the USA at the time of purchase.  The power drawn by the shared UPS is 850 watts.



x2.... I'm running a case less mobo now with 2 5830s. Soon to be 3 as soon as my cables show up. Should also help out with the heat issue.

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matt_b
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June 23, 2011, 04:37:42 PM
 #8

Why not a 6970?
l33
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June 23, 2011, 07:55:47 PM
 #9

This card is looking good to me  http://www.newegg.com/Product/Product.aspx?Item=N82E16814161349. I am thinking about 4 a system.

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June 23, 2011, 08:04:36 PM
 #10

I have 2 x 5870's (2 GPU's) and 2 x 6990's (4 x GPU's) in two rigs, all running standard. I have found the 5870's have performed at a relatively constant 350 M/H whereas the 6990's fluctuate somewhat between 280-350 M/H due to temperature i.e. AMD Overdrive decreases the clock speed on two of the 6990 GPU's periodically. I have not ascertained whether I simply have a substandard 6990 card, or whether the configuration is not sufficient to dissipate the heat on standard for two cards side by side. That said I get a minimum of 1.1 G/H for the 6990 rig even when it has auto clocked down.

For raw power, the 6990 produces the desired results, even if for me it has not necessarily been the optimal result.

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June 23, 2011, 08:15:14 PM
 #11

ATI Radeon HD 58xx series are better than 6xxx series at mhash per cost of card, that's why they are sold out everywhere. Being able to ever break even on new card by mining is very iffy now. If you are going to be gaming and just hobby mining, you should get whatever card suits your gaming needs.

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June 25, 2011, 03:28:03 PM
 #12

People keep saying that the 5XXX are better than the 6xxx(only for bitcoin).  I guess I'll try a 58xx Rig. If i can find the eq.

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l33
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June 27, 2011, 03:21:34 PM
 #13

So what card will give me the best mhash--forget about price?

-- l33 --
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mike678
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June 27, 2011, 03:43:36 PM
 #14

I believe most of these are average overclocked speeds but it will give you an idea.
https://spreadsheets.google.com/spreadsheet/ccc?key=0AsSwOT3E1XTGdGtpa1BQcmJLN2x6TG1MRmxzb29BeFE&hl=en_US&authkey=COWC8toK#gid=0
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June 27, 2011, 04:03:37 PM
 #15

So what card will give me the best mhash--forget about price?

Best Mhash will come from a 6990x2, but as the above poster said, you need to consider a lot more than just that.  The best mhash/watt is from the 5830.  I chose the 6870 because I got a good price and I thought it was a good mhash/$.  If you re severely limited with space then you go for a more powerful (and expensive) care. If you have plenty of space and slots, then you try to go for the best mhash/$. 

The 5800's and 6800's are pretty good sweet spots for all of those statistics.

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l33
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June 27, 2011, 04:51:23 PM
 #16

Okay, good point. I am about to buy my first card withe Bitcoin i have been saving. I am in the $200 rang. I guess the 5830 is a good place to start.
 

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June 27, 2011, 05:25:37 PM
 #17

Depends on if your rig is soley for mining. If you plan on gaming as well, go for a 6950 or 6970. If you want to build a 24/7 mining rig, go for the 5830 or 5850/70. 5870 will actually mine a little quicker than the 6970 based on the stream processor count.

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June 27, 2011, 06:32:44 PM
 #18

since i bot online games i will get the more powerful 6970. knowing that i can later use it in another machine to bot with
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June 27, 2011, 07:44:18 PM
 #19

I think the most bang for your buck is 5970.
l33
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June 27, 2011, 08:43:41 PM
 #20

Yeah, I keep seeing that.....Okay, So 5 rigs with 4 5850s each. I think that is the past I'll take.

-- l33 --
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