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[Official] 7870 Tahiti LE (XT) Owners Club - Page 430

post #4291 of 5223
Hello i'm back with some news !
My Sapphire 7870xt was heating causin' crashes.
So I bought two fans and some MX-4 thermal paste. I put the two fans on the front and place a third fan at the bottom of the case blowing air directly on the card.
And no more crashes ! tongue.gif
My card never reach 70° anymore. And I even won some FPS in games !
post #4292 of 5223
Quote:
Originally Posted by tp4tissue View Post

OR

I've found the problem with ALL stock heatsinks is that it blows hot air ONTO the card.. Freakin stupid...righ..??

This should be how ALL cards come stock... with a 120mm tower that blows outward away from the card


Both of those designs arent space friendly at all, lol
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post #4293 of 5223
safe to undervolt?

so i have 2 of these cards.

one came stock with 1150 at 925 and 1219 at 1000 and one was 1188 at 925 and 1256 at 1000. gpu-z

so what i did was used VBE7 to put both cards o 1150 at 925 and 1000..

everything seems ok.. i ran unigine for hours and been playing BF4 for hours at a time with no crashing..


but, should i go higher on the 1000 voltage? maybe 1188?

1188 is stock voltage for these cards at 925?


i checked the asic and the one that had lower volts was 74% and the other one is 64%.

i also cranked up the fan to 100% at 70c and my temps dont go much over 60.
 
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post #4294 of 5223
^of course,

mine's running at 975 core @ 1.038V Temps reaches 61c max 45% fan speeds, when stress testing with far cry 3 .
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post #4295 of 5223
Quote:
Originally Posted by jlsmndz View Post

^of course,

mine's running at 975 core @ 1.038V Temps reaches 61c max 45% fan speeds, when stress testing with far cry 3 .


hmm, maybe i can try to go lower.. think the next one down is 1094..
 
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post #4296 of 5223
Indeed you can go lower. Especially on the 74% ASIC card. My card is 73,1% and i ran 1.049mV @ 1000Mhz.
On the 64% card i think you can get away with 1.075mV @ 1000Mhz.
post #4297 of 5223
i have them both running at 1049 now on the 925 and 1000 settings. 300 and 500 are locked at 950.

i dont have a 1075 option and the next lowest one is 950.. i tried 950 but games wont load, it goes black screen then they drop to desktop.
the cards are voltage locked so the only way to change the volts is bios flashing. it goes 950,1049,1151, 1163, 1188, 1219 and 1256, those are the only options.


everything seems ok, ran unigine for about an hour and the temps never hit 60.


i put the 74% card the main one.
 
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post #4298 of 5223
Yep the voltages are predefined because you use XFX and XFX uses a different voltage regulator. For example PowerColor and Sapphire users can freely adjust the voltage and the end result is only +/- 2 compared to what they set. For unsupported voltage controllers VBE uses predefined voltage adjustments.
post #4299 of 5223
Welp, I've officially shed my Crossfire 7870 MYST cards for a single eVGA GTX 780. Believe it or not, it was a slight upgrade simply because the framerates are far smoother and the card is very quiet. On benchmarks alone, the dual HD 7870 MYST cards were faster, but for gaming joy, I'm simply loving the 780.
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post #4300 of 5223
Ya, not planning on going back to xfire here anytime soon. Too much hassle with games that don't get supported. Single monster card > 2 weaker ones for me.
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