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OPTY 165: What's the difference between 2.798ghz and 3.0ghz?

post #1 of 17
Thread Starter 
Hey Guys,

My Opty 165 is currently 24 hours orthos stable at 2.792ghz at 1.38vcore at 35C. It will do 2.880ghz at 1.392vcore at 38C, and 2.970ghz at 1.584vcore at 45C. (These latter two speeds were only tested on orthos for 15 mins.)

Questions:

(1) What is the performance difference between 2.8ghz and 3.0ghz?

(2) Will my Opty last longer if I only slightly overvolt it (like 1.38v), as opposed to overvolting to 1.4v, 1.45v, 1.55v, or 1.6v? When I get above 1.55v or above, my temps climb to 45C or more. (Using Zalman 9700) If they are going out of stock, I'd hate to burn it out in 6 months and not be able to get a replacement....

(3) I heard an Opty can only reach 3.0Ghz if the temp is 45C or under, is that true? Wouldn't that take watercooling to achieve?

What do you think?
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post #2 of 17
1. it depends what you use it for. but always aim for higher!
2.yes, lower volts will make your CPU last longer, but the lifespan shortened by moderately higher volts is not alot, and you should not have to worry as long at you keep the load temps below 55C
3. Optys can reach 3Ghz at any temp, but it it safe it the temperature if below 55C, which takes good aftermarket air cooling or water cooling
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post #3 of 17
Quote:
Originally Posted by nobhillguysf2 View Post
Hey Guys,

My Opty 165 is currently 24 hours orthos stable at 2.792ghz at 1.38vcore at 35C. It will do 2.880ghz at 1.392vcore at 38C, and 2.970ghz at 1.584vcore at 45C. (These latter two speeds were only tested on orthos for 15 mins.)

Questions:

(1) What is the performance difference between 2.8ghz and 3.0ghz?

(2) Will my Opty last longer if I only slightly overvolt it (like 1.38v), as opposed to overvolting to 1.4v, 1.45v, 1.55v, or 1.6v? When I get above 1.55v or above, my temps climb to 45C or more. (Using Zalman 9700) If they are going out of stock, I'd hate to burn it out in 6 months and not be able to get a replacement....
(3) I heard an Opty can only reach 3.0Ghz if the temp is 45C or under, is that true? Wouldn't that take watercooling to achieve?

What do you think?
1. Not much. Maybe an other 100 pts in 3dmark05/06....or a possible 5-6FPS in games.

2. 1.6 volts is when noticeable deterioration begins. Most CPU's are made to last atleast 10 years...it could possibly shave one of those years off @ 1.6 volts.

3. Keep your temps under 55C, and you'll be fine. Don't pump more than 1.55volts into that chip if you have air cooling. 1.6volts is max for water; and 1.7 for those crazy Phase Changers.
    
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post #4 of 17
Thread Starter 
The highest stable (15 minutes on orthos) I was able to achieve was 2.970ghz at 1.58Vcore at 45C.

When I raised the ref clk to 340mhz, opty would fail orthos almost immediately on 1.58v (46C), again at 1.62v (49C) and again at 1.66v (51C).

Do you think I'm done at 2.970?

BTW, memory timings were 2-2-2-5 2T with 1:2 divider

Do you think I could get a higher overclock on my opty if I loosened my memory timings?

My stepping is CCBBE 0610 DPMW
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post #5 of 17
Quote:
Originally Posted by nobhillguysf2 View Post
The highest stable (15 minutes on orthos) I was able to achieve was 2.970ghz at 1.58Vcore at 45C.

When I raised the ref clk to 340mhz, opty would fail orthos almost immediately on 1.58v (46C), again at 1.62v (49C) and again at 1.66v (51C).

Do you think I'm done at 2.970?

BTW, memory timings were 2-2-2-5 2T with 1:2 divider

Do you think I could get a higher overclock on my opty if I loosened my memory timings?
Yes, try lowering your timings a bit. That should do it. Or maybe try another divider setting.

BTW... nice setup.
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post #6 of 17
Quote:
BTW... nice setup.
yeah, but he might want to grab a 7600GT to hold himover to DX10
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post #7 of 17
Thread Starter 
Thanks! I like it. The Graphics Card is a POS tho.... Im thinking about getting my mitts on a 8800GTS.... I've heard the 8800GTX really needs a Core 2 Duo to keep it up to speed, so I thought I shouldn't waste my money on a 8800GTX.
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post #8 of 17
Quote:
Originally Posted by nobhillguysf2 View Post
Thanks! I like it. The Graphics Card is a POS tho.... Im thinking about getting my mitts on a 8800GTS.... I've heard the 8800GTX really needs a Core 2 Duo to keep it up to speed, so I thought I shouldn't waste my money on a 8800GTX.
That Opty is no slouch. It may not be C2D, but even a C2D will bottleneck an 8800GTX. You would still have one fast machine that could play anything you threw at it.
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post #9 of 17
Thread Starter 
Related Question: At what point, if any, would it be worth it to spend the $350+ for a Koolance Exos-2 watercooling system?

I'm not sure the extra 200 or so mhz I could coax outta my Opty would be worth it....

Any opinions?
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post #10 of 17
I have the same DFI mobo and I can't find the memory divider, what is it called?
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