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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 921

post #9201 of 38701
Quote:
Originally Posted by svthomas View Post

Quote:
Originally Posted by tsm106 View Post

That's called vram choke and it is a form of stuttering. I don't monitor my vram usage at all but did Alexey change the way AB reads vram? It used to read all vram and then you'd divide that by x number of cards? I assume things have changed and it reads individual vram now?

It showed it all on my AMD cards, and I would need to divide, but it seems to not be that way with my Nvidia cards. Only reason I say that is because as soon as it goes a few mb over 2gb my frames take a hit. I am going to mess around with it a bit more right now.

Ok, that's right. AMD cards are read differently. I remember now. wink.gif

Yea, you are hitting vram choke. There's nothing you can do really, it's just mathematics at this point imo. Viva la 680 4GB!
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post #9202 of 38701
Yeah, it read right on my 3 480's. Still showed only 1400-1500 for my limits. Now with these I've seen up to 3800 but never hit a limit so I guess I'm good up to 6000 biggrin.gif
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post #9203 of 38701
I'm lost with my asus directcu ii 7970. Everything is great with the card yet when I clock past 1125 I get slight artifacts but once it gets to 1200, thats when these black and white triangles start replacing textures, like chess boardish. In 3dmark it causes black and red lines, but if I change the voltage to 1.68v it becomes stable in 3dmark. Any other voltage and back to artifacting. Im stable with the.1.68v on dirt 3 for eg with v sync. But with v sync off it artifacts. I've clean installed and tried different drivers and anything else you can think of, i've most probably done it already. You reckon this could be resolved with a future bios update? Seems too coincidental that it only becomes unstable beyond the max ccc limits. Mem clock is 1700 by the way.
post #9204 of 38701
Interestingly I feel like my 7970's perform smoother than my 580's did which I never really noticed stuttering. In 3DMark11 specifically I feel like the action is much smoother now than with my old setup even though I was perfectly happy with the 580's. It's probably just a matter of the 7970's outputting 20-30 more fps than my 580's were and the fact that I have a 120Hz monitor capable of displaying that increase...
post #9205 of 38701
Quote:
Originally Posted by Majin SSJ Eric View Post

Interestingly I feel like my 7970's perform smoother than my 580's did which I never really noticed stuttering. In 3DMark11 specifically I feel like the action is much smoother now than with my old setup even though I was perfectly happy with the 580's. It's probably just a matter of the 7970's outputting 20-30 more fps than my 580's were and the fact that I have a 120Hz monitor capable of displaying that increase...

I've found using dual card setups from both companies that games will feel choppy under 60 frames and they will feel fine over. I don't know why people act like there is some kind of science to it.
    
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post #9206 of 38701
ok. lately my card is having problems with my monitor blinking on and off randomly. when I reset afterburner it goes away.

Is that a bad sign?
Edited by 1rkrage - 4/17/12 at 7:42pm
 
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post #9207 of 38701
Quote:
Originally Posted by 1rkrage View Post

ok. lately my card is having problems with my monitor blinking on and off randomly. when I reset afterburner it goes away.
Is that a bad sign?

You using DP on your monitor? I've had my DP monitor randomly black-screen for no apparent reason but my DVI monitor hasn't had any issues...
post #9208 of 38701
Quote:
Originally Posted by Majin SSJ Eric View Post

You using DP on your monitor? I've had my DP monitor randomly black-screen for no apparent reason but my DVI monitor hasn't had any issues...

I'm using an HDMI. I previously tested the overclock with OCCT so was worried that I overclocked too much. (1180 mV 1180 MHz 1440 MHz mem 80.8% ASIC)


no artifacts now when I test at same overclock on OCCT so idk what gives
 
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post #9209 of 38701
Quote:
Originally Posted by gaul View Post

METRO 2033, ALL MAX OUT
7970 @ def ( 925 / 1375 )
7970i.jpg
GTX 680 @ 1110 ( with Boost ) and 1500 mem
gtx680.jpg

Woow 7970 beats 680 in this game thumb.gif (Halo bro Gaul hehe ketemu lagi disini ya biggrin.gif )
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post #9210 of 38701
Cleaned this thread a bit rolleyes.gif

SV, you may be right about the vram thing ... but unfortunately the methodology of the testing that led to that particular deduction is not quite conclusive. Lowering AA does lower vram usage, however, it also lowers the load on the GPU, so it's hard to be quite sure, based on your published observations. Esp. when the fps change is relatively small going from 2x to 4xAA ... it could caused by vram usage going over with 4xAA, or it could just be too hard for the GPU to process 4xAA at that resolution, and it's keeling over a bit.

One way to maybe tell a bit more conclusively is that, in theory, running out of vram should bottleneck your gpu usage somewhat. Thus, if you find you actually get higher GPU usage at 2xAA than you do at 4xAA, it would go a ways towards confirming the 'I'm out of vram and it's hurting my fps' hypothesis.

Interestingly enough, according to the [H] review, at triple monitor resolution, SLI 680's distinctly outperforms 7970XF in terms of max playable settings, esp. in multi-player mode (which uses more vram than SP) ... although they found neither could really handle MSAA at all at 5760x1200 in MP, and both could only do 2xAA in SP. I'll link the article but it's getting a 404 at the moment ... funny I'z just looking at it yesterday headscratch.gif

Anyways, what I'm getting at is the contents of the erstwhile article makes me question whether the situation you describe is truly caused by the 2gb limit, as there was no advantage to 7970XF over 680SLI in terms of max playable settings whatsoever. The 680's were actually stronger according to that article.

Generally speaking, one has a good amount of 'headroom' where a game can 'use' 20-25% over what your card has onboard before it starts to really suffer in perf, at least in terms of a substantial change in AVG fps ... stutters could become more common perhaps at a lower % use 'overage', though.
Edited by brettjv - 4/17/12 at 11:04pm
    
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