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Belial's Comprehensive Guide to 7950s! - Page 15

post #141 of 311
Thread Starter 
Quote:
Originally Posted by KingT View Post

I would like to see if there's another HD7950 that has better cooling than DC2.

My HD7950 DC2T hits 54C max in games and benches like Valley, heaven, 3DMark 11 at overclocked speed 1050/1750MHz (1.050V) and fan hitting 34% max with my fan profile (barely audible).

Warning: Spoiler! (Click to show)
2r7ajw6.jpg


CHEERS..

1.05v... are you kidding, I didn't even know 7950s could be undervolted so far. And heaven is hardly a stress test. Not trying to be snarky but your test is hardly stressing the card. It's like saying your civic can drive on the highway for 3 hours no problem, A+ it's a great car!

But please, would you mind posting results with 1100mhz+, 1.15v and with 1.25v+, on 100% fan speed? And ambient temps (or rather, hot or warm or cool room, is it A/C or not, in a case or out of case)? That'd really be helpful.

I mean my Sapphire 7950 with 35% fan speed hits at 1100mhz@1.15v hits only 59C in heaven in a warm room, no A/C, small case. It also hits 85C+ at 100% fan speed with intensity 20 on GPGPU work or OCCT in the same settings.

OP has been updated. There are 2 types of Elpidas out there guys, 50F and 60F (50F = 5ghz, DDR, 60F = 6ghz DDR). Which is funny, because all 7950 models, even ones with 60Fs, are sold at 1250mhz, when the stock speed is actually 4/6ghz=1500mhz. 60F Elpidas overclock to 1600-1700 guaranteed, while 50Fs only do 1400-1600. Not huge, but definitely useful info. I only know about my sapphires, but if people could read what they're elpidas actually say (it's hard to tell between 50F and 60F, but you can).

Also some additional info, detail, corrections about VRM cooling and power pins on the various models.


I currently plan to buy an older gigabyte 7950, buy some enzotech mosfet coolers, and do an h60 mod for ~$40. At $275+$44 = 319, I think that's a very fair price for an awesome performing 7950, and is more profitable in GPGPU work than any other alternative.

Also, I replaced the fans on my Sapphire Dual-X with 2x120mm fans (CM Sickeflows) and my temps actually rose 10*C+ .... i say + because they overheated, they could be 30*C+ worse for all I know. I think it's part that 1800RPM sickeflows aren't as good as 3.6k RPM 90mm fans, sickeflows have poor static pressure, and that a lot of the CFM is lost by overhanging the card. Maybe some 2200RPM Yates would do better... but how much better? Quite dissapointing.
Edited by Belial - 6/5/13 at 9:57pm
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post #142 of 311
What GPU stress test do you recommend?
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post #143 of 311
best thread ive seen so far. +sub and +rep. would love to see one for 7970 and future amd cards.
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post #144 of 311
Quote:
Originally Posted by Belial View Post

1.05v... are you kidding, I didn't even know 7950s could be undervolted so far. And heaven is hardly a stress test. Not trying to be snarky but your test is hardly stressing the card. It's like saying your civic can drive on the highway for 3 hours no problem, A+ it's a great car!

But please, would you mind posting results with 1100mhz+, 1.15v and with 1.25v+, on 100% fan speed? And ambient temps (or rather, hot or warm or cool room, is it A/C or not, in a case or out of case)? That'd really be helpful.

I mean my Sapphire 7950 with 35% fan speed hits at 1100mhz@1.15v hits only 59C in heaven in a warm room, no A/C, small case. It also hits 85C+ at 100% fan speed with intensity 20 on GPGPU work or OCCT in the same settings.

My card is not undervolted, stock voltage is 0.993V for 900/1250MHz (ASIC 77.9%).

In Furmark at stock 900/1250 GPU hits 62C max and fan goes up to max. 24%, now try that with your card and with that fan speed. :-)
Warning: Spoiler! (Click to show)
fxh6rl.jpg

On higher OC I don't run Furmark or OCCT as my card does not have any VRM cooling, but in games @ 1050/1750MHz my GPU goes max up to 56C and fan hits max 35% with my fan profile (Crysis 2, Crysis 3, Metro Last Light etc.).


CHEERS..
     
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post #145 of 311
Thread Starter 
Quote:
Originally Posted by KaRLiToS View Post

What GPU stress test do you recommend?

I recommend 5 minutes of OCCT Error check. Full screen. If all you do is game and/or dont care for rock hard stability, don't do the error check (or just use your game as a stress test if you can, ie wont lose ladder points for a crashed game).

what error check does, is run the same image as fast as possible, instead of an animation as fast as possible, but it compares each image to the last to make sure there are no artifacts. So you can run it and not watch the monitor, and the vast majority of artifacts are also too small and quick for the human eye to notice. Your temps won't go as high as quickly with error check, but it's a way better stress test practically. Theoretically, non-error test would be better if you could perceive the artifacts superhumanly as it's slightly more stressful but that isn't going to happen. You can stare at the screen and you won't see the vast majority of artifacts on an unstable overclock. I find the difference between 'normal stable' and 'error check stable' to be around 50-100mhz.

Like with stress testing anything, it all depends on your usage. I do GPGPU work, so I need rock solid stable. If all you do is game, then you don't need such stability. I also stream, and a crash during a stream is very bad so I can't have that either, so rock hard stability is important to me, but for most it isn't so important. I also appreciate knowing my hardware intimately, and knowing its' exact limits, I've many times tested for rock stability in something, and then just upped the overclock a few notches, knowing exactly what kind of instability I can expect.

But that's me. Just if you dont test for rock hard stability, dont go around saying X overclock is possible if it isn't fully verified. It's just misinformation.
Quote:
best thread ive seen so far. +sub and +rep. would love to see one for 7970 and future amd cards.

That's because it is the best thread. Thanks.

You likely won't see one from me for 7970s. I hope someone else will copy me and do so though (with proper credit, of course). I reluctantly wrote this guide.
Quote:
On higher OC I don't run Furmark or OCCT as my card does not have any VRM cooling, but in games @ 1050/1750MHz my GPU goes max up to 56C and fan hits max 35% with my fan profile (Crysis 2, Crysis 3, Metro Last Light etc.).


CHEERS..

As I understand it, the Asus DC2 uses higher quality mosfets so it doesnt need vrm cooling (plus, that 100mm fan on it). You should be fine to test, not to mention you have VRM temp sensors anyways.

If you are hitting 62C max on furmark at stock I'm worried the DC2 really isn't that great a cooler. Can you please submit a real stress test, most fans dont go to 24% (yours probably doesnt, you set it to 24 or it says 24 but in reality it probably bottoms around 30-40 like most do). Just run the fans at 100% and run a more reasonable voltage and overclock.

Try the 925mhz@1.25v boost setting that cards all ship with these days. If significantly lower quality cards can do it just fine, you should be able to (or really they can't run that just fine, they overheat on stress tests lol). Seriously, quit *****footing around, your VRM will whine before it reaches explode temps. And with 100mm fans on it, it won't explode anytime soon, it should run similar temps to your core so as long as your core is below 100C, your VRM will be fine.

SALUTATIONS!?!?
Edited by Belial - 6/6/13 at 2:11am
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post #146 of 311
Quote:
Originally Posted by Belial View Post

As I understand it, the Asus DC2 uses higher quality mosfets so it doesnt need vrm cooling (plus, that 100mm fan on it). You should be fine to test, not to mention you have VRM temp sensors anyways.

If you are hitting 62C max on furmark at stock I'm worried the DC2 really isn't that great a cooler. Can you please submit a real stress test, most fans dont go to 24% (yours probably doesnt, you set it to 24 or it says 24 but in reality it probably bottoms around 30-40 like most do). Just run the fans at 100% and run a more reasonable voltage and overclock.

Try the 925mhz@1.25v boost setting that cards all ship with these days. If significantly lower quality cards can do it just fine, you should be able to (or really they can't run that just fine, they overheat on stress tests lol). Seriously, quit *****footing around, your VRM will whine before it reaches explode temps. And with 100mm fans on it, it won't explode anytime soon, it should run similar temps to your core so as long as your core is below 100C, your VRM will be fine.

You don't quite understand and that's the issue, on V1 DC2 HD7950 Asus uses reference PCB form AMD, so there/s no "quality mosfets" on V1 as it's identical to any other HD7950 with a reference PCB design.

My fan was set @ auto while running Furmark, so it's curve was controlled by BIOS for these DC2 cards.

Minimum fan speed is 10% and it speeds up ftom there to a max 24% for GPU temperature of 62C and VRM's are reaching 85C.
Now with a slight overclock VRM's would reach 100C in Furmark.

You do with your cards VRM whatever you want but as long as my don't have any passive cooling on top I would not run Furmark while overclocked, as Furmark pulls extra 30% of power trough voltage circutry.


CHEERS..
Edited by KingT - 6/6/13 at 5:35am
     
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post #147 of 311
Why are you suggesting that he turns his voltage way higher when the voltage hes got it set to is sufficient? You dont have to run 1.25v. 1.05v is not undervolted......
post #148 of 311
Thread Starter 
Quote:
You don't quite understand and that's the issue, on V1 DC2 HD7950 Asus uses reference PCB form AMD, so there/s no "quality mosfets" on V1 as it's identical to any other HD7950 with a reference PCB design.

dude you can monitor your VRM temps... just keep them below 90C and test away. If you're VRM temps are severely limiting your GPU overclock, then say so and show so. But I don't understand what you are doing here, you are saying "I'm afraid to drive on the freeway because my car explodes at 60MPH so therefore I avoid leaving the neighborhood with my lamborghini".
Quote:

My fan was set @ auto while running Furmark, so it's curve was controlled by BIOS for these DC2 cards.

Then set it to 100% so we can compare absolute performance of your card, auto profile is useless because its apples to oranges and 100% tells us the maximum cooling capability of the heatsink (and along with videos online of the DC2 at 100% fan speed, we can judge sound and performance/sound). Auto fan profiles are useless for comparisons because one heatsink runs at 60% fanspeed when another runs at 40% and both at different temps in the end (and even worse, different clocks/voltages).

Are you just not getting anything I'm asking here? Please, use a real overclock on your card that we can all use to compare against other 7950 models, and do it apples to apples. 100% fan speed, and a high (not extreme) overclock like 1100 Core //1600 memory//1.25v. That will definitely not burn out any 7950 model in a 2 minute test (except maybe reference).
Quote:
Minimum fan speed is 10% and it speeds up ftom there to a max 24% for GPU temperature of 62C and VRM's are reaching 85C.
Now with a slight overclock VRM's would reach 100C in Furmark.

85C is quite warm, but it isn't too hot for a VRM. You can handle 90C for a stress test and up to 100C if it's just for a minute. If you run your fan at 100%, you'll also find your VRM will run much cooler.

You are complaining about your VRM temps, but if you run your fan at 24%, no slurp your VRM is overheating. As I stated in the OP, VRMs' often tend to overheat way before your core does. You are bragging about how awesome your cooler is to run at 24% but you are overheating. No one runs 24% fan speed like that because the VRMs will get too hot.

Come on. Stop being a dope, run 100% fan speed with a proper overclock and report to us what your core temps are. And VRM temps too, that'd be awesome too.
Quote:
Why are you suggesting that he turns his voltage way higher when the voltage hes got it set to is sufficient? You dont have to run 1.25v. 1.05v is not undervolted......

...sooo we can compare coolers? I'm not asking him to run it 24/7, I'm asking for him to run a 2 minute heat test. 1.05 is way too low a voltage to compare to or stress the card, that's significantly undervolted considering that most 7950 models ship at 1.15-1.25v, especially with all the 'boost' bios cards nowadays which are all at 1.25v. 7950s generally get hot at 1.15v+, with 1.25v a great setting to test a GPU cooler out.

No one cares what his card does at auto profile or 24% fan speed, none of us can mirror 24% fan speed on our cards. The difference is that with 100% fan speed, we can compare the maximum performance of these different cards. His VRM also wouldn't be overheating at 100% fan speed.

It'd be nice if he set something like 1.15-1.25v, and told us how his card performed at 100% fan speed. That way, we could compare it. I could test my sapphire at the same overclock as his, at 100% fan speed, and report my temps. Obviously varying ambients and case fans affect performance, but if there was a 1-5*C temp difference, we could write it off as maybe just ambients and the 2 models aren't vastly different in cooling performance, and if he had a 10-20C temp difference, we might start asking questiosn on whether the sapphire was crap or the asus was awesome or if maybe our ambients were very different and we'd investigate further.

KIRK OUT---
Edited by Belial - 6/7/13 at 8:12am
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Hard DriveCoolingOSMonitor
Samsung 830 128gb Corsair H110 w/4x 140mm Yate Loon High Blues W7 x64 Ultimate Yarrgh Matey Dell U2312HM Matte IPS 1080p 
MonitorMonitorKeyboardPower
Sanyo DP19640 18.5" 768p KDS Rad-7xp 1024p CM Storm Quickfire Rapids Brown Rosewill Capstone 750 
CaseMouseMouse PadAudio
Bitfenix Shinobi Modded CM Storm Spawn Steelseries Diablo 3 2 set CD Speaker + Big Sub 
Other
Bitfenix Recon Fan Controller Moded 
CPUMotherboardGraphicsRAM
Delidded i7-3770K 5GHz@1.499 Gigabyte Z77X-UD5H 1.1 Sapphire Dual-X 7950 3L Boost 4x2GB Mushkin Ridgeback 2200mhz 8/11/8/27 1.75v... 
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Intel X25-M 80GB SSD NH-D14 SE2011 Noctua 120/140/140 Fans 3 x Yate Loon Mediums (Petras) 2 x NZXT Havik 140mm Fans 
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Phillips FW-C250 2 Speaker Set w/3 CD Changer JBL Sub 6 Subwoofer NZXT Sleeved LED Strip 1m Blue NZXT Sentry 2 Fan Controller 
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Intel X25-M G2 80GB SSD NH-D14 SE2011 6 x Case Fans (4 x YL-M, NZXT case fan, CM Hype... Jerryrigged Chipset-Northbridge 80mm HSF 
CoolingOSMonitorKeyboard
Jerryrigged VRM Heatsink (sawed off stock AM2 h... Hax'd W7 Ultimate 64bit Sanyo DP19640 19"1360x768 Ducky Cherry Browns 10keyless 
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post #149 of 311
LOL you sound like you know my card better than me and still you dont own one.

As a matter of fact I have a couple of your's PM's aking me about DC2 series and also in this thread because you don't know anything about DC2 AMD based cards.

DC2 cooler is the best there is for HD79xx series when it comes to "out of the box" cards.

The only air GPU cooler that's more capable is Arctic Cooling Xtreme HD7970 , due it's gigantic size and triple fan design.

So there's no need for a comparision , there are reviews on the net, look them up and you'll se that DC2 beats every cooler on the market except AC Extreme.

Here's a nice review of HD7950n DC2 TOP V2, and there you can see that DC2 beats Twin Frozr III cooler hands down, in performance as well in noise.
Both cards were overclocked to the max with 1.3V and over 1.2GHz core, DC2 max temp was 66C and TF III was 81C,

DC2 cooler speed up to 1500rpm and TFIII to 4200rpm, and that shows how much bigger cooling capacity DC2 cooler has compared to TwinFrozr III.

REVIEW LINK


But you seem to know everything about HD7950/70 even though a couple of weeks ago you knew very little.. lachen.gif


CHEERS..
     
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post #150 of 311
Is it me or is this thread rather hostile? I thought guides are for sharing info not beating ppl over the head with it?
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