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[Official] AMD HD 69xx Owners Club - Page 216

post #2151 of 3890
I hit the 80's on stock.
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post #2152 of 3890
I must have a really bad 6950. I can barely hit 900/1350 @ 1.2v and anymore OCing i just crash with the sound loop Also above 1350mhz on the mem i get degraded performance. What gives lol
Also does anyone know if 1.25v is safe 24/7?
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post #2153 of 3890
Thats due to ECC ... ur vram is just bad, RMA!!! NOW!!
my 6950 (unlocked) is running at 5010MHz vram ~ 6040MHz QDR!!! WoHHooo!

1.25 is OK !!
its actually not that far away from 1.75 ( the same chip is used in the 6970 at higher clocks, higher volts) that AMD rated the chip @ .
1.3 Troubles me..

I had a problem @ anything over 910@ 1.22Vcore..
Guess what! Final : 935@1.245Vcore and I can manage 960 @ 1.275Vcore, but not worth the extra heat(clocks - > linear heat increase, but volts->Exponential increase ; combine both and the world goes bOOm ) , and higher volts means basically a shorter lifespan for your silicon ! but You're prolly gonna change ur card before the GPU chip dies Even with 1.25V I don't think you're looking at anything lower than a 5-6 year lifespan , and other PCB components get strained too .. so the GPU is the least likely to die out , think of the VRMs.
Tried unlocking ?? I found that the same Vcore for a stock 6950 gave me 950core and for an unlocked 6950 gave me 915core :/
A small increment and now I'm at 935 w/ significantly better performance.. better than a mild 6970 OC and that gives me more than my money's worth!
post #2154 of 3890
Quote:
Originally Posted by Uncivilised View Post
I must have a really bad 6950. I can barely hit 900/1350 @ 1.2v and anymore OCing i just crash with the sound loop Also above 1350mhz on the mem i get degraded performance. What gives lol
Also does anyone know if 1.25v is safe 24/7?
So goes the luck of the draw. Does the card run fine at stock speeds? The last I checked, even overclocked cards weren't hitting over 1300 for memory speeds.

One thing I keep seeing crop up is people assuming a specific model of anything is guaranteed to overclock. Simply put; no it isn't. You buy a product running at a given speed. If you can get more out of it, that's an added bonus. If not, the piece is not "junk," it is exactly what you purchased, and will likely run fine for years at stock speeds. I highly doubt anything on the card is bad, as another mentioned, but simply won't run higher. I assume you could RMA, but there is no guarantee the company is going to help you.

Finally, has anyone ever checked what speed the RAM is rated for? If memory serves, the 6950 doesn't have much headroom for overclocking as far as the RAM is concerned. My opinion: if you want the higher speeds, get that card that is more likely to do them.
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post #2155 of 3890
WHHHHAAAT???? My vram does 1510 from 1250 !! LIKE COME ON!
these chips are rated for 1250 -- > But isn't this just obvious ! The same vram chips cant vary by SO much!

If thats not headroom , I don't know what is..
AND I haven't even tried for higher!
post #2156 of 3890
Quote:
Originally Posted by 0razor1 View Post
WHHHHAAAT???? My vram does 1510 from 1250 !! LIKE COME ON!
these chips are rated for 1250 -- > But isn't this just obvious ! The same vram chips cant vary by SO much!

If thats not headroom , I don't know what is..
AND I haven't even tried for higher!
You are a single case. It does not mean your card is the gold standard by which others are measured. Congratulations on your overclock, but just because you did it does not mean everyone else will, or that another person's card is bad because it won't. The RAM is spec'd to run @ 1250. Anything beyond that may not work, and I would think is not guaranteed in the least. Yes, any chip can vary regarding how much it is able to overclock, and for my experiences, RAM is especially finicky.

My 6970 experiences are this: 1000/1500 core/mem on stock voltage. But that is not the norm for the card from what I've seen with other cards. I'm also not shouting that everyone should do it. I'm simply glad I can. Even if it didn't overclock, I'd still be happy with the performance.
Edited by UnexplodedCow - 7/11/11 at 7:45am
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post #2157 of 3890
The hynix memory MSI put's on their 6950 TFIII PE and Lightnings are rated for 1600MHz but the clock is reduced.
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post #2158 of 3890
I have an ASUS 6950 2GB, count me in...
    
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post #2159 of 3890
@Unexplodedcow <--- lol nick
Vram on a majority of these cards clock 1400+ w/ no sweat! Strange how that guy can't budge ! I've never seen vram NOT overclocking.. even a 9400gs overclocks for crissakes!~

@ lethalrise!
AFAIK , these are the ratings on the 69xx chips :
1. 6950 -- QDR : 5000 / 1250 MHz
2. 6970 -- QDR : 6000 / 1500 MHz


RANDOM : Just saying , what stock clocks reflect are the manufacturer's design! If I wanter to put out a card with overclocked ram , I could IF THE VRAM PERMITTED IT ( like my MSI TF3 is stock oc'd to 1350! from 1250). Now if I wanted to downclock them I could sell a 6970 at lower than 1500 so when ppl hit 1500 MHz on stock volts, thats to be expected of the vram.
But then there's other factors : heat tolerance , Power phases , Memory controller capability..

A very good example of a bad Memory controller is the 6850 :/ I had one of those... they simply wouldn't go above 1200MHz , and would peak somewhere b/w 1180 ~ 1240 MHz despite being capable... BAD MEMORY CONTROLLER on the GPU :@ BAD AMD :@
Edited by 0razor1 - 7/11/11 at 8:37am
post #2160 of 3890
As noted by LethalRise750, the TFIII apparently runs faster RAM chips, so it can safely run faster, but it's not reference design in terms of RAM, and some have reported the shaders are hard cut.

I haven't tried pushing my car yet, but eventually will, once I have motherboard and CPU again, and will really see how well the water can keep it cool.
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Sovereign
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