PSA: Malta 7990s are NOT suitable for mining!

[dogie]

When Mining SHA256, Memory clocks are reduced and the GPU cores are Ran like a bat out of hell...

When Mining Scrypt, the Clocks on both the CPU and memory are ran at a ratio of 0.57 to 1.

Either way, you're not pulling the max power draw the card is capable of.

Taco time stated 170w per 7970 while mining on unbinned Tahiti chips.

So 340 for this card, and add 15w for the crossbridge, 365w.

Close but under the limit.

...why are you trying to guess numbers when I have actual power consumption? 400 a card with minimum memory clocks and voltages, slightly undervolted cores. Thats on SHA256

[1714992290]

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[1714992290]

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[1714992290]

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[Miner99er]

When Mining SHA256, Memory clocks are reduced and the GPU cores are Ran like a bat out of hell...

When Mining Scrypt, the Clocks on both the CPU and memory are ran at a ratio of 0.57 to 1.

Either way, you're not pulling the max power draw the card is capable of.

Taco time stated 170w per 7970 while mining on unbinned Tahiti chips.

So 340 for this card, and add 15w for the crossbridge, 365w.

Close but under the limit.

...why are you trying to guess numbers when I have actual power consumption? 400 a card with minimum memory clocks and voltages, slightly undervolted cores. Thats on SHA256

Because you don't have a Malta 7990.

[dogie]

When Mining SHA256, Memory clocks are reduced and the GPU cores are Ran like a bat out of hell...

When Mining Scrypt, the Clocks on both the CPU and memory are ran at a ratio of 0.57 to 1.

Either way, you're not pulling the max power draw the card is capable of.

Taco time stated 170w per 7970 while mining on unbinned Tahiti chips.

So 340 for this card, and add 15w for the crossbridge, 365w.

Close but under the limit.

...why are you trying to guess numbers when I have actual power consumption? 400 a card with minimum memory clocks and voltages, slightly undervolted cores. Thats on SHA256

Because you don't have a Malta 7990.

-_- the cores are identical?

[goxed]

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202036

[relm9]

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202036

$50 above MSRP? Way to go Newegg...

[dogie]

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202036

$50 above MSRP? Way to go Newegg...

I think its probably the distributer charging a pretty penny for the first batch, where demand is guaranteed to outstrip demand.

[Dyaheon]

-_- the cores are identical?

Not exactly. The new Maltas have the lowest consuming cores available, AMD is doing some serious binning with them.

[cdog]

Apparently they are terrible for gaming because of some random screen hitching which is visible but not detectable by FRAPs, hasnt been fixed with latest drivers, so until thats fixed the resale value for these is borked, useless for gaming, and I cant see why you would buy one for mining as 7950s still offer MUCH better value.

[dogie]

-_- the cores are identical?

Not exactly. The new Maltas have the lowest consuming cores available, AMD is doing some serious binning with them.

Which made ~5% difference according to the reviews.

Apparently they are terrible for gaming because of some random screen hitching which is visible but not detectable by FRAPs, hasnt been fixed with latest drivers, so until thats fixed the resale value for these is borked, useless for gaming, and I cant see why you would buy one for mining as 7950s still offer MUCH better value.

It was fixed with the prototype drivers, which may have been 13.5 pre beta.

[phillipsjk]

Here we go again, you're forgetting TDP is not max capable power draw. The specified TDP is only what the stock heatsink is required to dissipate. What do you think happens when you overvolt and overclock? Same goes for cpus. An i5-3570k has a tdp of 77 watts but overclock it and power consumption can easily double that number.

Somebody is wrong on the Internet.

For electronics, TDP is the same as power draw, to the point that it is sometimes easier to measure the change in temperature than the actual power draw. When you overclock or over-volt a chip, you change the TDP (hopefully not in a way you can't compensate for: such as using a lower ambient temperature).

Molex connectors next to PCIe slots are not part of the slot. Those connectors are likely there becuase the slot connector can not supply more than 75W safely, as stated by the spec quoted by dogie. But what do I know? I wash dishes for a living.

PS: RE: your claim 375Watt TDP equals ~500Watts of power draw. I have 2 possible theories of where you got your information:
1. Online Power supply calculators grossly overestimate the required power. They either want to sell you a large PSU, or assume the PSU you purchase will be sub-standard.
2. Volt-Amps (at the wall) is NOT the same as Watts. For non Power-factor Corrected power supplies, you "waste" about 1/3 of the current (assuming power factor of .67, if my math is right). This wasted current causes resitive heating in the wiring, but otherwise does not draw any power. This happens when the current peaks do not line up with the voltage peaks in the power cycle. It means you get current flow at the zero voltage crossing. (Power=(current)(voltage), by example  (5A)(0V)=0W)

[dogie]

Here we go again, you're forgetting TDP is not max capable power draw. The specified TDP is only what the stock heatsink is required to dissipate. What do you think happens when you overvolt and overclock? Same goes for cpus. An i5-3570k has a tdp of 77 watts but overclock it and power consumption can easily double that number.

Somebody is wrong on the Internet.

For electronics, TDP is the same as power draw, to the point that it is sometimes easier to measure the change in temperature than the actual power draw. When you overclock or over-volt a chip, you change the TDP (hopefully not in a way you can't compensate for: such as using a lower ambient temperature).

Molex connectors next to PCIe slots are not part of the slot. Those connectors are likely there becuase the slot connector can not supply more than 75W safely, as stated by the spec quoted by dogie. But what do I know? I wash dishes for a living.

PS: RE: your claim 375Watt TDP equals ~500Watts of power draw. I have 2 possible theories of where you got your information:
1. Online Power supply calculators grossly overestimate the required power. They either want to sell you a large PSU, or assume the PSU you purchase will be sub-standard.
2. Volt-Amps (at the wall) is NOT the same as Watts. For non Power-factor Corrected power supplies, you "waste" about 1/3 of the current (assuming power factor of .67, if my math is right). This wasted current causes resitive heating in the wiring, but otherwise does not draw any power. This happens when the current peaks do not line up with the voltage peaks in the power cycle. It means you get current flow at the zero voltage crossing. (Power=(current)(voltage), by example  (5A)(0V)=0W)

^_^ Thank you, finally someone with some sense!

[rograz]

It was fixed with the prototype drivers, which may have been 13.5 pre beta.

It was improved in a lot of titles but far from all, and it's still a lot worse than SLI. Crossfire is for all intent and purposes still quite useless (why bother when 2 gtx660 TI gives a better experience than 2x7970s). Best case atm you are looking at 50% "perceived" higher FPS with crossfire vs one card while the benched FPS scaling is in the 90%+ range. AMD have at least acknowledged the problem for some time and in some popular titles they have almost eliminated the problem as long as you use vsync or cap your fps.

The pre-beta drivers simply put the 7990 on the same level as 2 7970s in crossfire, they didn't solve the micro stutter problem completely, yet. AMD spent to long trying to get crossfire scaling as high as possible while Nvidia seems to have focused more on actually making SLI usable, it wasn't until a few large tech sites started bashing AMD for the poor experience with crossfire last year that they started looking at it.

[dogie]

It was fixed with the prototype drivers, which may have been 13.5 pre beta.

The pre-beta drivers simply put the 7990 on the same level as 2 7970s in crossfire

A 7990 is 2 7990s

[Dyaheon]

So anyone have one of these new 7990s yet? Kinda interested in some mining results.

Sadly the price seems really steep, quite a bit more than the older, beefier 7990s with triple PCI-e power connectors and triple slot coolers. Not going to be worth it if they're mediocre mining cards.

[greaterninja]

So anyone have one of these new 7990s yet? Kinda interested in some mining results.

Sadly the price seems really steep, quite a bit more than the older, beefier 7990s with triple PCI-e power connectors and triple slot coolers. Not going to be worth it if they're mediocre mining cards.

I am getting 2 x gigabyte 7990s tomorrow, I'll test one out and let u guys know.   So far the 7790, 7870 xt and 7950 cards seem to be the best cards for the $.

[bobsmoke]

with a dual gpu 7990 club 3d if you have enough cooling you should get around 1.2Ghz....of course with a lot of noise due to the fans that it brings.

[dogie]

Continuing greaterninja's thread because he cried and locked it: https://109.201.133.65/index.php?topic=200628
He left a lot of misnomers which should not be continued by the community.

As I recall you were saying the card would use over 500 watts, in reality it uses ~375 watts at max load and it still performs as well as the 1st generation 7990 but uses 2/3 the space of the first generation 7990.  

1) No I didnt, I said it will be power limited. If you're maxing out at STOCK CLOCKS and slightly undervolted, on bitcoins, have fun scypting.
2) Same performance? Nope, my cards are 1300+, yours are 1150.
3) 2/3 the space? Great, now try and use the card.

You also said it would cost $2000 dollars when it costs $1000-$1100.

For two cards *facepalm*

...the only thing you were maybe right about is the cooling and that is still for dispute as you use many more fans than I use to ventilate the card.   So all in all you weren't right about much.  You more so blurted out a bunch of nonsense and acted like a huge forum troll...good try at trying to be right.

Many more fans? I am using TWO of these cards, TWO. So yes, I do have 2 more fans than you because im generating another 400W+ of heat in the same space.

tldr: I warned you, you spent $3.3k on 3 cards and are now trying to sell them because you realized I was right. Enjoy your financial loss because you were so arrogant.

[greaterninja]

Continuing greaterninja's thread because he cried and locked it: https://109.201.133.65/index.php?topic=200628
He left a lot of misnomers which should not be continued by the community.

As I recall you were saying the card would use over 500 watts, in reality it uses ~375 watts at max load and it still performs as well as the 1st generation 7990 but uses 2/3 the space of the first generation 7990.  

1) No I didnt, I said it will be power limited. If you're maxing out at STOCK CLOCKS and slightly undervolted, on bitcoins, have fun scypting.
2) Same performance? Nope, my cards are 1300+, yours are 1150.
3) 2/3 the space? Great, now try and use the card.

You also said it would cost $2000 dollars when it costs $1000-$1100.

For two cards *facepalm*

...the only thing you were maybe right about is the cooling and that is still for dispute as you use many more fans than I use to ventilate the card.   So all in all you weren't right about much.  You more so blurted out a bunch of nonsense and acted like a huge forum troll...good try at trying to be right.

Many more fans? I am using TWO of these cards, TWO. So yes, I do have 2 more fans than you because im generating another 400W+ of heat in the same space.

tldr: I warned you, you spent $3.3k on 3 cards and are now trying to sell them because you realized I was right. Enjoy your financial loss because you were so arrogant.

Nope.  You said 1 card costs $2000, and 1 card will use over 500 watts to get the same hash power or it will hash a lot less.  The new malta uses less space and performs more efficiently for the power. The malta still hashes 1150 MH/s - 1250 mh/s easily.  Now you might be right about the temperature, however everything else you were wrong on.   Finally, I am selling each card for a significant profit, certainly not because of financial loss.     Congrats at making such a big deal out of what you really don't know or have.

[computerparts]

 

[dogie]

Continuing greaterninja's thread because he cried and locked it: https://109.201.133.65/index.php?topic=200628
He left a lot of misnomers which should not be continued by the community.

As I recall you were saying the card would use over 500 watts, in reality it uses ~375 watts at max load and it still performs as well as the 1st generation 7990 but uses 2/3 the space of the first generation 7990. 

1) No I didnt, I said it will be power limited. If you're maxing out at STOCK CLOCKS and slightly undervolted, on bitcoins, have fun scypting.
2) Same performance? Nope, my cards are 1300+, yours are 1150.
3) 2/3 the space? Great, now try and use the card.

You also said it would cost $2000 dollars when it costs $1000-$1100.

For two cards *facepalm*

...the only thing you were maybe right about is the cooling and that is still for dispute as you use many more fans than I use to ventilate the card.   So all in all you weren't right about much.  You more so blurted out a bunch of nonsense and acted like a huge forum troll...good try at trying to be right.

Many more fans? I am using TWO of these cards, TWO. So yes, I do have 2 more fans than you because im generating another 400W+ of heat in the same space.

tldr: I warned you, you spent $3.3k on 3 cards and are now trying to sell them because you realized I was right. Enjoy your financial loss because you were so arrogant.

Nope.  You said 1 card costs $2000, and 1 card will use over 500 watts to get the same hash power or it will hash a lot less.  The new malta uses less space and performs more efficiently for the power. The malta still hashes 1150 MH/s - 1250 mh/s easily.  Now you might be right about the temperature, however everything else you were wrong on.   Finally, I am selling each card for a significant profit, certainly not because of financial loss.     Congrats at making such a big deal out of what you really don't know or have.

WHY WOULD I SAY ONE CARD COSTS $2000, are you kidding me. I was always comparing dual cards. I'd ask you to quote me but I know you'll just come up with some excuse again and then lock the thread again.... OH WAIT ITS MY THREAD.