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7950 Vapor X Voltage Locked? - Page 91

post #901 of 1056
Quote:

*The only difference I can tell between the settings on the old bios and this one is that memory is @ 1575 rather than 1770.. its capped there for some reason. Probably have to unlock MSI AB, but I didnt think it was worth the trouble. Didnt expect these results..

So weird...

MSI afterburner may not be optimized for the BIOS. TRIXX unlocked verison works best for unlocking speeds and stability on my 950mhz Edition HD7950.
Edited by SonDa5 - 2/25/13 at 12:26pm
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B.K.T.
(24 items)
 
  
CPUMotherboardGraphicsGraphics
De-Lidded direct die mount Intel i7-4790k No IHS ASUS Z97 WS Sapphire HD7950 OC 950mhz Edition Sapphire HD7950 Vapor X 
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GSkill 2400mhz CL9  Samsung 840 caviar black Hitachi 
Hard DriveOptical DriveCoolingCooling
OCZ AGILITY 4 LG 16x BD burner DT Sniper CPU block Watercool HEATKILLER® GPU-X³ 79X0 Ni-Bl  
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Swiftech pump 655 Alphacool NexXxos UT 60 420mm 3x140mm Bgears 1800 RPM fans in pull on radiator Windows 7 Pro 64bit 
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BenQ XL2410T SS 6gv2 Seasonic Platinum 860 Silverstone Raven RV02-BW 
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post #902 of 1056
Quote:
Originally Posted by Derpinheimer View Post

Can you try either of your settings under Furmark or Heaven and post the VRM1 and VRM2 power out? I have this strange feeling that despite my suspiciously low voltage, the power draw is higher. ASIC 87% here as well, or 86.8% to be specific.

LOL. I have exactly the same feeling :-)

Lets match our settings for the test.

Can you set your card to 1150 @ 1.137 and 1650 @ 1.5V and run Furmark @ 1280x720 + MSAA 2X (these settings seem to need most juice). And of course vsynce forced OFF in CCC.

Lets run the test for 10minutes and take readings then.
post #903 of 1056
So, here's mine:



1150MHz @ 1137mV
1650MHz @ 1500mV

fan constant 70%
post #904 of 1056
We should use the same fan speed as well since power draw increases as temps increase.

And just to try something out with the new BIOS, I tried 1250 @ 1200mv. [1.162vDroop]
Core temp max 70c
VRM1 max 107c
VRM2 max 89c
VRM1 out 203.5W [!?]
VRM2 out 40.8Ww

Nevermind ,I see you posted the fan speed now xD

Well unfortunately mine throttles to 850MHz, although the current is only 140a. I think this bios may have a lower power limit..

Eh, nevermind, when I run it for awhile it somehow averages out to this:

Edited by Derpinheimer - 2/25/13 at 1:11pm
post #905 of 1056
1200 @ 1187mV
209A * 1.057V = 221W

VRM1 jumped to 100C+ and I stopped. I think it would hit 110C and start to throttle.

my card has enormous vdroop and is power hungry as hell
post #906 of 1056
Sorry I keep editing while you write your posts wink.gif

Our vDroop appears to be about the same.

I will try the other Bios on my card. I think its a V09.. boost? Eh, whatever.
post #907 of 1056
Yeah, I use V09.
And can't get it to throttle no matter what I throw at it.
post #908 of 1056
Okay, I tried V09 with those settings. Current was building up to about 200A, and then I had my little HWinfo alarm for VRM overheat go off so I got scared and turned it off xD.

101c VRM1
84c VRM2
66c Core
200W on VRM1 [Stll rising as core heats up, maybe 5 more watts?]

Tried it again with same results. Let it go to 110c on the VRM, max pwoer draw [aside from an odd spike to 254A] was going to ~197A, so it seems like 200A.


Now.. how is it possible that two of the same cards at the same settings with the same BIOS and same program have such different power draw?
Edited by Derpinheimer - 2/25/13 at 1:30pm
post #909 of 1056
Was that with 1150MHz@1137mV? Mine hit 177A*1.025V = 181W.

edit:

yeah yours is apparently more leaky, but what is more surprising that you actually need less voltage to get the same results, while it is said that the leaky chips need more voltage.

I need 220W for 1200MHz. I guess you can do 1200MHz with less total power?
Edited by glina - 2/25/13 at 1:38pm
post #910 of 1056
I found current current reading more useful than average [unless you managed to get GPU-Z started after furmark, because otherwise the results are tainted with idle current being mixed in]

So its 177A vs ~200A at just about the same voltage. Mine drooped a bit more than yours.

So you think this extra wattage is "leakage"? What does that mean -- where is it going? I tried 1.1v and got basically the same results as you, mid 170A current.

When it comes to voltage being used to say, "Oh, my card can do X and Y voltage", is this even useful, considering the wattages can be so odd? Or is the goal not the temps and power consumption, but the longevity and increased overclocking headroom that go with the lower voltage, higher wattage card?

Also, what did you run to measure Amps for 1200? I was running FarCry 3.
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