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[Official] AMD Radeon HD 6850/6870 Owners Thread - Page 106

post #1051 of 6939
Quote:
Originally Posted by SIR-IP View Post
Thanks. Sounds good so @ 1050Mhz It beats the stock 6870 , The reason I Asked is that I was thinking to Return this card and get a 6870 , cuz its only 30$ more .The only game Im going to play is BlackOps and Mw2 and the 6850 is good enough for these game . I just wanted to be more futureproof but i think ill keep my 6850 .
Have a look at THIS review. They compare an OC'd 6850 and 6870 with the stock versions. Also has 460's in there too.

Good way to see where they stand stock vs. OC'd.

I'm still on the fence if I should get the 6850 or the 6870. I also mainly just play COD but if I am going to upgrade from my 5770 I want it to be a nice upgrade and not just a little better.

OC'd 6850 is looking pretty sweet though.
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post #1052 of 6939
Just got my PC back. Will be overclocking all night.
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post #1053 of 6939
Quote:
Originally Posted by SkillzKillz View Post
Just got my PC back. Will be overclocking all night.
NICE ! I really wanna see some results !! I got the core up to 960Mhz but there was a burning smell comming form my PSU poor thing its only 400W Generic so I have to get a real PSU now until then I cant OC it
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post #1054 of 6939
Quote:
Originally Posted by SIR-IP View Post
Is a 6850 at 900Mhz the same as a stock 6870 ?
Quote:
Originally Posted by mjl4878 View Post
I'm curious as to this as well. Wonder how mine performs at 950/1150 compared to the 6870
Quote:
Originally Posted by SIR-IP View Post
Thanks. Sounds good so @ 1050Mhz It beats the stock 6870 , The reason I Asked is that I was thinking to Return this card and get a 6870 , cuz its only 30$ more .The only game Im going to play is BlackOps and Mw2 and the 6850 is good enough for these game . I just wanted to be more futureproof but i think ill keep my 6850 .
Quote:
Originally Posted by gonX View Post
Yeah the 6870 has more shaders and texture units - 1120 and 56 TU's vs the 6850's 960 shaders and 48 TU's.

Apart from that, they're identical.

*EDIT*

Also on paper, if you were to overclock a 6850 to 1050 MHz core clock you'd beat a stock 6870 in all scenarios.
There was a review that looked at a handful of 6850s and said that if you OC it to 940mhz/1150mhz it matches the HD 6870 stock.

Quote:
Originally Posted by SIR-IP View Post
NICE ! I really wanna see some results !! I got the core up to 960Mhz but there was a burning smell comming form my PSU poor thing its only 400W Generic so I have to get a real PSU now until then I cant OC it
915mhz/1150mhz
stock voltage (1.1149)
Max Temp: 83C
Status: Failed

Well this isn't a good start D;
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post #1055 of 6939
Quote:
Originally Posted by SkillzKillz View Post
There was a review that looked at a handful of 6850s and said that if you OC it to 940mhz/1150mhz it matches the HD 6870 stock.



915mhz/1150mhz
stock voltage (1.1149)
Max Temp: 83C
Status: Failed

Well this isn't a good start D;
940MHz sounds a bit off.
Let's calculate it - to simplify things a bit, let's assume the memory frequency is the same (it's fairly easy for a 6850 to run the memory at 1100MHz):

6870: 1120 Shaders and 56 TU's
6850: 960 Shaders and 48 TU's

6870: 900 MHz stock clock
6850: 775 MHz stock clock

To simplify it further, let's skip the TU's since they are rather situational.

From that, we can deduce that at stock clocks, the 6870 is ((1120 * 900) / (960 * 775) = 1.3548) ~1.35 times faster than the 6850. So the 6850 would have to be overclocked to (775 * 1.3548 = 1049.97) ~1050 MHz to beat the 6870 in most scenarios.

If we want to get really pedantic we can include the TU's as well, though I'm not too sure how much of an effect they have (I assume not too much):
(1120 * 56 * 900) / (960 * 48 * 775) = 1.5806

That means the 6850 would have to be at (775 * 1.5806 = 1224.97) ~1225 MHz core clock to beat a stock 6870 in every single scenario.
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post #1056 of 6939
Quote:
Originally Posted by gonX View Post
940MHz sounds a bit off.
Let's calculate it - to simplify things a bit, let's assume the memory frequency is the same (it's fairly easy for a 6850 to run the memory at 1100MHz):

6870: 1120 Shaders and 56 TU's
6850: 960 Shaders and 48 TU's

6870: 900 MHz stock clock
6850: 775 MHz stock clock

To simplify it further, let's skip the TU's since they are rather situational.

From that, we can deduce that at stock clocks, the 6870 is ((1120 * 900) / (960 * 775) = 1.3548) ~1.35 times faster than the 6850. So the 6850 would have to be overclocked to (775 * 1.3548 = 1049.97) ~1050 MHz to beat the 6870 in most scenarios.

If we want to get really pedantic we can include the TU's as well, though I'm not too sure how much of an effect they have (I assume not too much):
(1120 * 56 * 900) / (960 * 48 * 775) = 1.5806

That means the 6850 would have to be at (775 * 1.5806 = 1224.97) ~1225 MHz core clock to beat a stock 6870 in every single scenario.
You forget to factor in the memory clock.
post #1057 of 6939
What happens when you try to overclock Crossfired cards? I know they have to be at the same clocks, but can each card be at a different voltage?
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post #1058 of 6939
Count me in
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post #1059 of 6939
Loving my EAH6870 i have it at 1000mhz on core and 1110 on the memory so far temps are high though on idle around 66c, anyone know if this is normal for an ambient temp of about 26c to 27c?




JG
post #1060 of 6939
Quote:
Originally Posted by JG964 View Post
Loving my EAH6870 i have it at 1000mhz on core and 1110 on the memory so far temps are high though on idle around 66c, anyone know if this is normal for an ambient temp of about 26c to 27c?
Definitely not normal. Your system temperatures would have to be pretty high, like 50C. What are they?

Also, your cooler could not be seated right or requires the re-application of TIM.
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