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post #21 of 31
Keep trying different votages for the CPU, chipset, and me controler. Voltage changes effect the harmonics in electricity and they persay hav a sweet spot.
    
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post #22 of 31
Thread Starter 
Well i very much doubt the PSU is an issue for christ sake! And as for the HTT i've had it running as high as 1230Mhz as seen here....

http://uk.geocities.com/m_hill2029/HTOverload.jpg
 
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post #23 of 31
Exceeding the 1000 ish speed does nothing for productiviy, it can only add to the the posibility of instability!
    
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post #24 of 31
yeah what he said ^^^^^^
    
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post #25 of 31
Also remember that the .5 CPU multipliers does in fact effect the RAM speed... the half-multipliers run the memory at a lower frequencey for some reason... I don't remember exactly why, but CPUZ it will verify it.

That being said, I've got an Asus A8N-SLI Premium, an X2 3800+ and Corsair XMS Platinum and can't get stable at 2.8Ghz. Maybe our RAM doesn't like AMD's (I had trouble with my 3000+ Winchester as well). I'm running a TEC, so temperatures have nothing to do with it (at least in my case).

What voltage are you giving your RAM? I found that mine are the most stable at 1.75v. 1.7 and 1.8 are less stable.
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post #26 of 31
Thread Starter 
Not really messed with voltages to be honest, Corsair Value probably wouldn't like extra voltage imo.
 
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post #27 of 31
Thread Starter 
And my adventure continues....

Managed to get 2.8Ghz stable in windows & stress tests doing the following:

11.5 x 242Mhz (HTx4)
CPU Voltage 1.52 volts
DDR voltage (auto) <----- consair value so i don't trust increasing that lol
Memory Timings 3-3-3-11-14 /2T <------ fails 1T, this is the main reason of system instability so be aware folks.

After all this i decided to stay at 2.7Ghz due to the fact that the memory is at full performance with 3-3-3-11-14 /1T and 2.8Ghz would be a loss using the 2T timing, plus with the increased voltage & load temps it aint worth it.

Oh well, so there you have it 2.8Ghz is possible on the AMD64 3800+ venice with Corsair Value DDR400 but at a slight cost. If you have better ram you will get 3.0Ghz i guarantee.

Oh this will make you laugh ----> http://uk.geocities.com/m_hill2029/HTOverload.jpg
 
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post #28 of 31
Quote:
Originally Posted by Mhill2029
And my adventure continues....

11.5 x 242Mhz (HTx4)

Memory Timings 3-3-3-11-14 /2T <------ fails 1T,
You don'r say what speed the memory is at.

242X11.5 without a divider will run the ram at 232mhz which is probaably too fast for 1T, much less any decent timings. A 166 (5:6) divider will get your memory to 198.79mhz and should allow 1T command rate and tighter timings. 3-3-3-11-14 /2T is ugly at best.
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post #29 of 31
Thread Starter 
It's set at 333Mhz (the lowest setting is 200Mhz) in the Bios so i had more overclocking room, 333Mhz is a 2:1 divider isn't it? And the ram is running at 193.5Mhz although considering Dual Channel mode it would be 387Mhz and close to stock speeds.

It's totally stable for me at 2.7Ghz, but i wanted 2.8Ghz really or higher without the cost of memory performance. Btw could you show the equation on how memory is worked out by a system in terms of multipliers etc?
 
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post #30 of 31
Quote:
Originally Posted by Mhill2029
...........333Mhz is a 2:1 divider isn't it?
Btw could you show the equation on how memory is worked out by a system in terms of multipliers etc?
No. It's 5:6 (333/400)

Most people use FSB x Divider = Memory Speed (in mhz).
So: 250 x 183/200 = 228.75.5mhz. It's usually pretty close.

The "real" method is:
(FSB X Multi) / (Multi x 200/Divider) Rounded up to the next whole number
10 x 250/(10 x 200/183 rounded up)
Note that 10 x 200/183 = 10.93 which rounds to 11)
10 x 250/ (11) = 227.27mhz.

Or you can use:
AMD64 Calculator, http://www.geocities.com/edgemeal_software/
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