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6950: shader unlock vs 6970 flash? - Page 2

post #11 of 21
Just create OC profiles in CCC. One for Windows use, one for gaming.

Your memory may just not like running at higher speeds. 1375 is still a 175MHz overclock from a stock 6950 anyway. I don't see why using the 6950 BIOS vs the 6970 BIOS would allow a higher memory overclock.
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post #12 of 21
Quote:
Originally Posted by aznofazns View Post
JYour memory may just not like running at higher speeds. 1375 is still a 175MHz overclock from a stock 6950 anyway. I don't see why using the 6950 BIOS vs the 6970 BIOS would allow a higher memory overclock.
Stock HD 6950 memory is clocked at 1250MHz so that makes a 125MHz clock difference.


To OP:
Some cards simply can't handle the HD 6970 clock speeds. I have 2 Sapphire HD 6950's and one of my cards maxes at 1375MHz memory while the other maxes at 1350Mhz memory. As a result, I run my CFX setup at 1350MHz memory.

Both cores; however, can reach 920MHz @ 1.175V. I didn't test them individually so one could possibly clock higher than the other.

Due to one of my cards not being able to run at stock HD 6970 memory speeds, I used the shader only unlock method.

Try this:
Try running the Crysis: Warhead benchmark with memory set at 1250, 1275, 1300, 1325, 1350, 1375, 1400, 1425.

For me, I gained about 1FPS in CFX every 25MHz. At 1350 I plateaued. 1375 resulted in same FPS as 1350. 1400 started showed artifacts. 1425 showed showed artifacts and crashed the benchmark. So I settled for 1350.
Edited by compudaze - 3/1/11 at 2:30pm
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post #13 of 21
i guess i got a good card even though the ram wont go up any higher i mean i can run the card at 930/1375 stable. but i just think that for some reason i might be able to go higher with the 6950 bios because of the ram timing/voltage differences. i guess i will have to wait for a better bios editor for the 6xxx cards to come out before tinkering

Quote:
Originally Posted by compudaze View Post
Stock HD 6950 memory is clocked at 1250MHz so that makes a 125MHz clock difference.


To OP:
Some cards simply can't handle the HD 6970 clock speeds. I have 2 Sapphire HD 6950's and one of my cards maxes at 1375MHz memory while the other maxes at 1350Mhz memory. As a result, I run my CFX setup at 1350MHz memory.

Both cores; however, can reach 920MHz @ 1.175V. I didn't test them individually so one could possibly clock higher than the other.

Due to one of my cards not being able to run at stock HD 6970 memory speeds, I used the shader only unlock method.

Try this:
Try running the Crysis: Warhead benchmark with memory set at 1250, 1275, 1300, 1325, 1350, 1375, 1400, 1425.

For me, I gained about 1FPS in CFX every 25MHz. At 1350 I plateaued. 1375 resulted in same FPS as 1350. 1400 started showed artifacts. 1425 showed showed artifacts and crashed the benchmark. So I settled for 1350.
 
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post #14 of 21
Type here just to dont open another 6950-6970 tread..

wich are customs Core V for hd6950 and hd6970???
post #15 of 21

OK so last night I tried to do the unlock shader only mod and it didnt work out so well.
when i had the 6970 bios flash I am able to set my core up to 950mhz stable some what. as for the ram if it was to go anything over the 6970 stock 1375mhz I would get a funny lines and stuff when watching youtube videos and other gfx stuff.

the same happen when I use 6950 with unlock shader so the stock 800/1250 i can bump up the core not a problem. but if the 1250 get bump up more then the stock 6950 bios has it at it does the same thing

does anyone know why it would do that? I have made a youtube video of it watch the second lcd.


Quote:
Originally Posted by compudaze View Post
Stock HD 6950 memory is clocked at 1250MHz so that makes a 125MHz clock difference.


To OP:
Some cards simply can't handle the HD 6970 clock speeds. I have 2 Sapphire HD 6950's and one of my cards maxes at 1375MHz memory while the other maxes at 1350Mhz memory. As a result, I run my CFX setup at 1350MHz memory.

Both cores; however, can reach 920MHz @ 1.175V. I didn't test them individually so one could possibly clock higher than the other.

Due to one of my cards not being able to run at stock HD 6970 memory speeds, I used the shader only unlock method.

Try this:
Try running the Crysis: Warhead benchmark with memory set at 1250, 1275, 1300, 1325, 1350, 1375, 1400, 1425.

For me, I gained about 1FPS in CFX every 25MHz. At 1350 I plateaued. 1375 resulted in same FPS as 1350. 1400 started showed artifacts. 1425 showed showed artifacts and crashed the benchmark. So I settled for 1350.
 
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post #16 of 21
It could be that the GDDR5's voltage is increased on the 6970 BIOS. Is 1375 completely stable on the 6970 BIOS? Run Furmark to test it.
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post #17 of 21
yeah 925/1375 stable after 1hr in furmark
i have even tried to boost voltage via msi ab but even at 1.3 it d\\still does that. right now i am running 940/1375 stable but i haVE to turn up my fan to 55% which is no big deal
[IMG] furmark_000003 by alicklee, on Flickr[/IMG]
see my other post
http://www.overclock.net/ati/943682-...l#post12562498


Quote:
Originally Posted by aznofazns View Post
It could be that the GDDR5's voltage is increased on the 6970 BIOS. Is 1375 completely stable on the 6970 BIOS? Run Furmark to test it.
 
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post #18 of 21
http://3dmark.com/3dm11/752371 my 3dmark @ 940/1400 is the most the ram will clock too. and the most gain when compared to http://3dmark.com/3dm11/752211 @ 940/1375


during 3dmark11 if i clock it higher 1400mhz the ram becomes unstable and i get a score of 4936 http://3dmark.com/3dm11/752405
and at 950/1450 the system hangs during testing.
 
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post #19 of 21
i managed to have my 2gb HIS 6950 running 1536 shaders. 1000mhz clock and1500 mhz memory. seemed stable as long as the temps didnt go above 65. so i set the fan on 60% and left it running msi kompressor maxed out and then benched it on heaven maxed out. was sweet tongue.gif
post #20 of 21
Quote:
Originally Posted by macknade View Post

i managed to have my 2gb HIS 6950 running 1536 shaders. 1000mhz clock and1500 mhz memory. seemed stable as long as the temps didnt go above 65. so i set the fan on 60% and left it running msi kompressor maxed out and then benched it on heaven maxed out. was sweet tongue.gif

Got one lucky card there, nice job on the clocks!! I have 2x 2gb sapphire 6950 dirt 3 editions, neither card unlocked though iam running 930/1330 @ 1.150 on both cards! 3d mark11 score of 11,000 for graphics score
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