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HD7950 revised with reference HD7970 PCB club - Page 23

post #221 of 847
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Quote:
Originally Posted by Garming View Post

Yeup. I booted up Borderlands 2 right after I closed furmark with no issue this time. Pressed continue and my computer locked up and got this screen.

I am just puzzled to why this is happening. I had a TF3 with the 7970 pcb before getting this card and it overclocked fine. I only returned it because it was coil whining pretty bad (sadly the sapphire one does too). Did I just get a somewhat dud card? I mean, I don't need to overclock at this moment as stock speeds runs fine with no crashes, but it is just nice to know I can do it down the line when needed.
*using a seasonic x-660 psu. feeding power into my card with 1 modular cable that splits into 2, 6+2 pins.




Make sure ulps is disabled.
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B.K.T.
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post #222 of 847
Quote:
Originally Posted by cane316 View Post

Better to have 2 cables coming off your PSU rather that one split.
From that picture your voltage looks quite low, could be a lack of power.
I would say raise the voltage to 1100 maybe, your temps are already quite high though.
I don't use furmark though (GPU torture) so not sure what kind of temps should be expected with it.
what card is it?

Furmark is suppose to put the card is unrealistic stressed situations so when you find a stable OC in furmark, in theory it should be golden in games.

I have the Sapphire 7950 950mhz OC edition. So I am barely overclocking it and it is unstable in games but stable in furmark.
post #223 of 847
Quote:
Originally Posted by SonDa5 View Post

Make sure ulps is disabled.

Does that affect me though? I thought that was a crossfire/sli thing.

EDIT:

Just tried turning off ulps through trixx and it my computer locked up again.
Edited by Garming - 12/7/12 at 5:17pm
post #224 of 847
Thread Starter 
Quote:
Originally Posted by Garming View Post

Does that affect me though? I thought that was a crossfire/sli thing.
EDIT:
Just tried turning off ulps through trixx and it my computer locked up again.
If you are over clocking you need to disable ULPS. If you don't disable it your voltage will not stick and under load it will drop and the screen will blank out like the screen shots you posted.
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B.K.T.
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post #225 of 847
Quote:
Originally Posted by SonDa5 View Post

If you are over clocking you need to disable ULPS. If you don't disable it your voltage will not stick and under load it will drop and the screen will blank out like the screen shots you posted.

Nah, bullocks.
Never disabled ULPS on mine, never had these kind of things happening with my overclocked card...
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post #226 of 847
I picked up a used Sapphire OC 950 today. The price was right, and I wasn't entirely happy with my Gigabyte 7950 900 MHz WF3.

My old Gigabyte ran 1.09V stock, maxed around 1000 at that voltage and managed 1100 with about 1.14. More volts got a bit more out of it, but it wouldn't quite do 1200 at any voltage. Even watercooled....I dropped my GPU temps from near 70C to 38C load and that card gained exactly nada in the OC department (67% ASIC) The memory also sucked with 1400 MHz the limit.

So while it was a very capable card...when I had the opportunity to buy the Sapphire for the same or even slightly less money than what I'm flipping the Gigabyte for...I went for it. Card still has 7 months of warranty on it so a pretty safe bet anyway.

The Sapphire has 90.4% ASIC quality, but OK that doesn't say much. Defaults a full 0.1V lower than the Gigabyte though at 0.993.

The actual load voltage according to GPU-z is 0.98. With the stock cooler (+ the Gigabyte WF3 fans actually...because the Double X cover with fans doesn't quite fit my case. So I strapped the WF3 fans to it) it's running mid 60C load. VRMs ditto.

Without touching the voltage the card would run 3Dmark and Heaven at 1075 MHz which I found extremely impressive. At 1.00V actual (1.025 set) it runs at 1100 core all day long. I pushed onwards a bit but soon needed to put silly fan speeds on it to keep it within acceptable temps.

It actually runs 1200 core at 1.10V and memory 1700 at 1.65. I didn't test the memory too much but performance kept going up until I set it to 1800 where it locked up in 3Dmark.

After that it gets quite difficult very quickly. I don't like seeing over 85C VRM temp but they're impossible to keep cool with this cooler (has the stock heatsink on the VRM's but I am wondering if it's not doing more bad than good)

I even benched 1250 MHz at 1.111V actual. But any further than that was a no go. 1275 would start artifacting a little while into the tests...and going over 1.13V seemed to do absolutely nothing except overheat the core and VRM's even further. VRM's race towards 100C and the core is 80+ at this point.

Time to go back to water I think. It might well be that this card will never do more than 1250 regardless but it's the voltages that amaze me. And in any case, 1200/1250 is nothing to sniff at. I suspect that putting a WB on the core (I have an EKWB universal block) will drop VRM temps all by itself, hopefully putting a quiet fan and better heatsinks on them will keep them in the 70-80 range.

Will take a few weeks though because I had to order a new fitting for the block.

Some screenshots below...don't look at the actual 3D scores too much because I didn't bother rebooting between runs, just changing the clocks and that tends to score quite poorly vs rebooting every time. I was doing stability checks more than anything so wasn't worried about the score.












I wish I could have this card with the Gigabyte's VRM system...ran way, way cooler than the ones on the Sapphire card even though they had NO heatsinks on them.
Edited by JCviggen - 12/11/12 at 10:51am
post #227 of 847
Thread Starter 
Quote:
Originally Posted by JCviggen View Post

I wish I could have this card with the Gigabyte's VRM system...ran way, way cooler than the ones on the Sapphire card even though they had NO heatsinks on them.


Nice card. Hk block works well on it and upgrading Thermal tape to fujipoly helps as well.






Edited by SonDa5 - 12/13/12 at 6:55am
B.K.T.
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B.K.T.
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post #228 of 847
Has anyone tried using a 7970 ghz edition bios on their card? I'm really thinking of either flashing a ghz edition bios or the VTX3D X edition. It would be nice to run some high clocks without the need for afterburner.
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post #229 of 847
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Quote:
Originally Posted by BababooeyHTJ View Post

Has anyone tried using a 7970 ghz edition bios on their card? I'm really thinking of either flashing a ghz edition bios or the VTX3D X edition. It would be nice to run some high clocks without the need for afterburner.

I have tried a few different HD7970 BIOS to my Sapphire 950mhz ediiton HD7950 without any luck. I get no display from card and have to revert to 2nd working bios and flash working bios back on to 1st switch position bios.

If you are using the 950mhz edition BIOS that my card runs you can run Trixx instead of MSI AB.

SAPPER.zip 41k .zip file

Not sure if that is a possible solution for you.
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B.K.T.
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post #230 of 847
Can this card do 1.3volts with a fan over the vrm sinks? Or will the vrm's still overheat.
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