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Squeezing Sapphire 7950 OC Boost - Page 2

post #11 of 19
Thread Starter 
don't know about that score, for sure someone more reliable can tell you biggrin.gif

I am encountering a problem tho: from time to time my graphic card tends to reduce its voltage (VDDC) thus making my game crash. Is there any way to prevent that from happening? (I already deactivated CCC overdrive) and Board Power Li is set to +20
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post #12 of 19
No clue, I'm newer to this than you are. Is the card sticking at 500 MHz? If so, disable hardware acceleration for flash (right click a YouTube video) and restart your PC. That fixed the issue for me, but I'm not sure about the voltage issues.
post #13 of 19
LDC, have you tried forcing constant voltage with afterburner?
    
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post #14 of 19
Thread Starter 
Quote:
Originally Posted by foldslikepaper View Post

LDC, have you tried forcing constant voltage with afterburner?
mmmh no xD should I? My 7950 is Sapphire, will that software work anyway?
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post #15 of 19
Yes, afterburner will work with all brands. I use it with my sapphires. I'm not positive that this will fix your problem, but it's worth a shot!
    
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post #16 of 19
Thread Starter 
Quote:
Originally Posted by foldslikepaper View Post

Yes, afterburner will work with all brands. I use it with my sapphires. I'm not positive that this will fix your problem, but it's worth a shot!
tried it but couldn't activate voltage control (yes, I edited the .cfg file tongue.gif )
why in the world companies make us poor overclockers life's so hard... it would be so obvious to let the user decide if voltage (or any other parameter) should be constant or not *facepalm*
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post #17 of 19
Quote:
Originally Posted by _LDC_ View Post

tried it but couldn't activate voltage control (yes, I edited the .cfg file tongue.gif )
why in the world companies make us poor overclockers life's so hard... it would be so obvious to let the user decide if voltage (or any other parameter) should be constant or not *facepalm*

In afterburner, click settings, then click the general tab, then check unlock voltage control, check unlock voltage monitoring, and check force constant voltage. Hopefully this will help with your issue!
    
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post #18 of 19
Thread Starter 
Quote:
Originally Posted by foldslikepaper View Post

In afterburner, click settings, then click the general tab, then check unlock voltage control, check unlock voltage monitoring, and check force constant voltage. Hopefully this will help with your issue!
hehe that was the first thing I've done, even before editing the .cfg file smile.gif

btw, although I am still crossing fingers, it looks like I've located the major issue that was generating the random downvolting: disabling EPU on Motherboard I am not having that problem. Will try to push more and report back smile.gif
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post #19 of 19
Quote:
Originally Posted by Imprezzion View Post

These ''Boost'' cards are a true hell to overclock.

I got a Sapphire 7970 Boost myself and I FINALLYmanaged to get it to OC properly. The normal release version of TriXX, 4.3.0, does NOT work properly with ''Boost'' cards as they have other VRAM chips then the regular 7970's and the powertune options work differently.

I had a pretty long conversation with a guy on the Sapphire forums and I managed to get the card to OC pretty darn well with a special method and a modded BETA of TriXX 4.4.0b.

Link: http://www35.zippyshare.com/v/4022846/file.html

The stock BETA support voltage control on the core but has limited fan profile settings and no VMEM control. The modded version fixes fan control and has full VMEM VDDC control and VDDC as high as 1.381v for the core (1.30v loaded after vdroop).

Stock voltage is also higher on these cards. 1.254v VDDC in stead of 1.175v.

Now, the way to OC these cards is to FULLY DISABLE AMD Overdrive in CCC.

Then, install / start TriXX and turn the cards power settings to +50. (Scroll down in OC menu).

Ramp up the core and memory clocks to their values you can reach on stock voltage (which is 1.254v in TriXX)
Create a custom fan profile if you want and SAVE YOUR OC TO A PROFILE!

Test these settings briefly monitoring clockspeeds, voltages and temps through GPU-Z. Especially watch the VRM temps as they get HOT on these sapphires due to a crappy heatsink design on the VRM's. 105-110c is about the max for these VRM's. They are 125c 24/7rated but in my experience voltage becomes more and more unstable after 110c.

Now, if the temps are fine, ram up the VDDC to like, 1.350v orso but DON'T touch the clockspeeds.
First find the maxx VDDC you can run on your card before either the core or the VRM's overheat. On mine the VRM's overheat a LOT faster then the core, but after a few mods to the VRM sink I can now run max VDDC (1.381v) without them overheating.

If your VDDC + temps max out at like, 1.381v then just increase core clocks slightly, 10-25Mhz per step, over your previous max while running somehting like Heaven 3.0 in a loop until you get crashes or artifacts.

Keep watching temps and voltages as you run though.

Also, I found out these cards have completely different VRAM chips which run on 1.5v in stead of the stock 7950/7970's 1.6v chips.
These chips don't even get CLOSE to the OC capacities of the stock VRAM. They do 1800+Mhz regularly on 1.64v.
These chips struggle to get above 1600Mhz even if you raise VMEM VDDC.

I run mine quite dangerously close to the edge, but honestly I don't care cause I dislike the card anyway.. Temperatures are too darn high, it's LOUD above 75% fanspeed and the limited / difficult OC is a real shame as I am a hobby overclocker and got some proper gear / hardware here and i'm not afraid of modding stuff tongue.gif Only this GPU isn't even worth it..

My settings and quite dangerously high temps during the most intense load I run, Far Cry 3 with everything maxed and many CCC improvements like Adaptive AA, Filtering asf:

Core clock: 1225Mhz
VMem clock: 1525Mhz
VDDC: 1.381v - Loaded gives about 1.29-1.31v after vdroop.
VMem VDDC: 1.518v.
Fanspeed: 100% beyond 60c GPU temps.
GPU Temp: 78c (100% fanspeed)
VRM1: 106c (100% fanspeed)
VRM2: 91c (100% fanspeed)

This is quite extreme and I wouldn't reccomment that you go THIS far but it's possible..

I just flashed the regular BIOS to my card, one with a 286W TDP limit when set at +20%, I had throttling issues at stock on my 7950 Sapphire 7950 on the stock BIOS. I ended up matching the BIOS' on them for good non-throttling clocks and I now get smoother FPS in games. Especially with Crossfire enabled.. Honestly I think all these "Frame latency issues" are just the cards throttling back with their stock BIOS and stock power limitations. The only game i ever noticed it in personally though was Far Cry 3 when it was new...

I do think that the problem is there but people make it out to be worse because of the cards throttling, it's because the 7950 was designed to run at 850MHz and people/AIBs are producing cards that run at 950MHz+ which is causing problems. The 200/220W factory BIOS is designed to be ran at 850MHz and will throttle in games. (Even at stock) on my HIS 7950 AND my Sapphire one.

The VRM's do heat up quite a bit more with the custom BIOS as it's delivering more power, but what else can one do?
 
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