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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 3709

post #37081 of 38721
Quote:
Originally Posted by Agent Smith1984 View Post



Anybody with an Asus card had this?? (I know I'm a 280x users, but it's the same memory on many cards, especially the 7970 Matrix, which is almost identical.

I have never been able to see or adjust the VRAM voltage on my DC2. GPU-Z does not report it (or almost anything else for that matter), and GPUtweak is useless. However, I can bench 2000 on the VRAM and do 1900 stable without the ability to adjust it...so my guess is the card has the higher stock voltage you are referring to. My MSI on the other hand wont do 2000, even with 1.7
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post #37082 of 38721
Can you adjust the 7950 memory voltage separate from the core voltage? And if so, what program do you use to do it with a Sapphire 7950, one that you have to use the modded Trixx version to unlock core voltage?
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post #37083 of 38721
Just recently got me a second hand HD 7990, I was able to OC to 1200/1650...here's some benches.

http://www.3dmark.com/fs/3045378



post #37084 of 38721
so how much memory vcore safe to upp with?.

i have MSI 7950. default memory vcore is 1.55v.
post #37085 of 38721
Quote:
Originally Posted by Agent Smith1984 View Post

Voltage over 1.55v seems to hurt the hynix chips in most cases.

Asus released their TOP cards with 1.6v and the memory actually artifacts for many people because of the overvolting.
They actually did this out of spec from the memory's capabilities.

I see people with 1.5-1.55v hitting 1800-1900 in some cases.

Mine does the 1800, but in some games with artifacts with these tiny little checkerboards. VERY strange, and even more common that it is strange.

They did release the BIOS to reduce the VRAM voltage, but even after doing that, I still report 1.6v, and it's hard locked. I can't reduce to 1.5v in AB or with BIOS edit.....


Anybody with an Asus card had this?? (I know I'm a 280x users, but it's the same memory on many cards, especially the 7970 Matrix, which is almost identical.


Asus TOP card sucked hard. Also i am using 1.7 volts for 3 years.

And the artifacts is mostly a latency issue
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post #37086 of 38721
Agreed on the sucking part....
What do you mean latency issue? As in Asus also aggravated the timings to the point of instability?
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post #37087 of 38721
Quote:
Originally Posted by Agent Smith1984 View Post

Agreed on the sucking part....
What do you mean latency issue? As in Asus also aggravated the timings to the point of instability?

Search for the stilt 7970 bios thread and if you read the comments you will see that most AIBs failed with the bios
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post #37088 of 38721
Yeah, I just think at the end of the day... for a rehash of an old card, the 280x has still been a good performer for me...

I mean, I got it inthe box with all the goodies, shipped to my door for $125 used...

I score over 8500 in FireStrike and it games for hours at 1200/1700 or 1250/1600 (am flashing a modified 50% power limiting BIOS this evening to get both clocks up hopefully).

I can bench at 1270/1825 with no artifacts, and it would go higher if I could get rid of the stupid vdroop. (even at 1.3v, it droops down to 1.209 mad.gif )

But gaming anything over 1700 on memory (in a few titles only), and I get those stupid checkerboard squares in one little spot of the screen.
Some flickering here and there too.....
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post #37089 of 38721
Quote:
Originally Posted by sugarhell View Post

Asus TOP card sucked hard. Also i am using 1.7 volts for 3 years.

And the artifacts is mostly a latency issue

You have used 1.7v on a GPU for 3 years? What kind of cooling do you use? Is it safe to have that much voltage going into a 79xx series card?
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post #37090 of 38721
FYI, He is speaking of VRAM voltage....
1.7v is a little high for that, but nothing dangerous
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