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HD 7950 Vapor-X, Just can´t manipulate voltage for OC purposes

post #1 of 8
Thread Starter 
Hello everyone, first time here, need your assistance, i hope u can help me smile.gif

ok, first of all, got this card (probably one from the lastest batch sold here in this part of the world, i mean Chile) about a month ago, hoping for great OC oportunities. By the time i started to try to change the voltage i realized that couldn´t, started to look for some info on the net, and belive me, considering that it is supposed to be voltage locked, (wich makes me very worried because i can´t rma the card here) i have tried almost EVERYTHING and nothing works; trixx on several versions (included a modded one), AfterBurner, and the last few days different vBios versions for the 7950, most o them useless (black screen and no power), from the 2 or 3 that worked out, didn´t changed anything but the RAM voltage to 1.6 (the stock vbios use 1.5), the rest exactly the same conditions (amd overdrive readed 1.25 v for the core, but GPU-z readed 1.185 on the same time). Got all the bios from here:

http://www.techpowerup.com/vgabios/index.php?architecture=ATI&manufacturer=Sapphire&model=HD+7950&interface=PCI-E&memType=&memSize=

The only thing i haven´t tried yet is to force constant voltage cuz i was told that this affects the longevity of the card.

On a basic test, i raised the card clocks, with the known limitations on the voltage, the core is very stable at 1100 mhz (using 1.18v according to amd overdrive), never got to see artifacts or something else, temps always under 60°c. When i get to the 1150 mhz on the core, the system stops functioning, obviously the card needs more power in orden to get higher clocks. I haven´t done anything yet with the vram clocks (i guess i would be useless to try if i can´t raise the core clocks in the first place).

Installed gpuz yesterday, according to it, my card has 69.9% of ASICS score (not bad i guess uh?), i wasn´t thinking on water cooling anyway, after changing my whole new PC system i just ran out of money.

Anyway, i have been reading alot on the net, kind of worried about supossed poor vrm cooling, and some batches with voltage locked, but in the end, all the peolple with this kind of troubles managed to get voltage unlocked, except me. The p/n and s/n for my card are:

p/n: 299-2E210-104SA

s/n: A132900011549

I was thinking that maybe there are som modded bios that should help, but i can´t find them. The card came by defalult with 015.025, tried with 015.018, 015.020-22-24 and nothing. Haven´t tried yet with a 7970 vapor-x vbios ¿should that help?.

Finally my specs are:

FX-6300 @stock 3.5 ghz
CoolerMaster hyper N520
SSD Toshiba 128 gb
Seagate barracuda 7200 rpm-320Gb
Kingston Hyper-x Predator DDR3 @ 2133 mhz (2 x 4 gb)
Asus M5A97 R2.0
Thermaltake smart series M 650 w 80 plus bronce
Coolermaster K350 MID tower

Anyway, considering that i have readed ALL its on the web, i would really aprecciate some new and diffentes ideas, a different database of vbioses that could work out, something considering that obvious things i already made them with no positive results.

If you still need some more info, just ask for it, am new with overcloking and i suposse i gave all of the info that you need to know what the hell is going on with my vapor-x, very expensive and i should be dissapointed if can´t get higher clocks that 1100 mhz on the core.

THX alot, sorry about my english if its bad written redface.gif

One more thing: a friend of mine is seting up my pc, just bought the hardware by myself and gave it to him to finish the job, almost done until we got to the OCing for the vapor-x card, we got stuck on this about a week ago.

Thanks again, i´ll be very interested to try anything that u think it might work
Edited by Laky Lait - 12/21/13 at 5:35am
post #2 of 8
Thread Starter 
Cmon, anyone plz help
post #3 of 8
Are you using the boost bios or the regular one? The card has a bios switch on the side. Also, did you increase power target? If not, up that to the maximum. Increasing the voltage without power target isn't going to yield you anything.

I have been using Trixx to overclock mine, so that shouldn't be the problem.

For testing, run Heaven benchmark on default settings and monitor GPU-Z for GPU clock fluctuations and voltage. The vdroop on these cards seems to be quite significant, so if you set 1.2V for example, GPU-Z will show it actually being a lot lower.
post #4 of 8
Thread Starter 
Yes, am using the boost bios (looks like the boost bios has a little more voltage parameters ir order to get 950 mhz on the core) that seems to let me get the core to 1100 mhz, and the vRAM to 1500 mhz as limit values, anything over than that, and the system reboot.

Gonna try heaven benchmarking as posted, í´ll let you know my results. THX

¿any other ideas?
post #5 of 8
Quote:
Originally Posted by Laky Lait View Post

Yes, am using the boost bios (looks like the boost bios has a little more voltage parameters ir order to get 950 mhz on the core) that seems to let me get the core to 1100 mhz, and the vRAM to 1500 mhz as limit values, anything over than that, and the system reboot.

Gonna try heaven benchmarking as posted, í´ll let you know my results. THX

¿any other ideas?
If your system actually shuts down upon bad overclock, then that sounds like a PSU problem to me. If the OC fails, the display driver should simply stop working, but quickly resume itself.

But you have yet to answer whether you have increased the power target or not.
Edited by Fulvin - 12/23/13 at 10:30am
post #6 of 8
Quote:
Originally Posted by Fulvin View Post

Quote:
Originally Posted by Laky Lait View Post

Yes, am using the boost bios (looks like the boost bios has a little more voltage parameters ir order to get 950 mhz on the core) that seems to let me get the core to 1100 mhz, and the vRAM to 1500 mhz as limit values, anything over than that, and the system reboot.

Gonna try heaven benchmarking as posted, í´ll let you know my results. THX

¿any other ideas?
If your system actually shuts down upon bad overclock, then that sounds like a PSU problem to me. If the OC fails, the display driver should simply stop working, but quickly resume itself.

But you have yet to answer whether you have increased the power target or not.


No, a terribad gpu oc can act just like a bad psu, ie. instant reboot. When ocing you shouldn't be pushing oc's too far too fast, instead a steady and gradual increase is recommended. Display driver crash and recover only happens when the you are still close to a stable oc. When you have gone far past your typical stable point, crashes happen.
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post #7 of 8
Thread Starter 
Ok, i was mistaken about the rebooting, actually when i push the clocks above 1130/1500 the display driver fails, all benchmark or test suddenly stops, like u supossed

About the power target, i did belial´s trick with the power limit on afterburner to prevent throttle (up tp 50%), but am still not able to move the voltage in order to get higher clocks..

Damn, i feel dissapointed, i wasn´t expecting this limitation when i spent my money on this card...doh.gif
post #8 of 8
Thread Starter 
so, ¿anyone have some ideas?
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