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Phenom II steppings and max OC 550-940 - Page 68

post #671 of 2829
hey can any of you guys try and get as much bus as possible? I'm curious if bus speed is also limited by temperature.

To give you guys a better idea of how to obtain your max bus:

1. install AOD
2. Restart the machine
3. Boot at higher than normal voltages (This can still be changed in AOD, but this is used for that voltages you can't)
4. Boot at a known bootable bus speed
5. Lower your multi down to an acceptable total speed (Don't forget to give room for bus speed increase)
6. Boot into Windows of your choice
7. Open AOD and start increasing the bus speed a few at a time. I usually start off going 5 or 10 at a time until I reach an uncertain area on the bus speed, and I start going 1 or 2 steps at a time.


323 bus seems to be my limit.
Edited by NCspecV81 - 1/28/09 at 6:29am
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post #672 of 2829
does bus speed increase cpu performance versus multiplier?
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post #673 of 2829
Quote:
Originally Posted by NCspecV81 View Post
I'm curious if bus speed is also limited by temperature.
NCspecV81, I think that is solely dependent on the chipset. If the user has sufficient cooling on the chipset then that shouldn't be to huge of a factor. If more voltage was added to the chipset, then that might make overclocking a bit more limited because of increased temperatures.

Quote:
Originally Posted by gsk3rd View Post
does bus speed increase cpu performance versus multiplier?
Gsk3rd, this is a good question. I've always wondered this as well
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post #674 of 2829
Quote:
Originally Posted by thlnk3r View Post
NCspecV81, I think that is solely dependent on the chipset.

Normally I would be inclined to agree with this, but shouldn't the bus speed be handled by the IMC on the cpu itself, along with the memory division, and final multiplied clock speed? I figured it would all be self-contained on the IMC, while the traditional NB handled the multplied NB Frequency to the rest of the components.

However, even in a traditional intel based FSB system where that is mostly maintained by the actual NB on the motherboard, cpu temperature still plays a rather large roll in FSB walls.
Edited by NCspecV81 - 1/28/09 at 9:40am
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post #675 of 2829
Quote:
Originally Posted by NCspecV81 View Post
Normally I would be inclined to agree with this, but shouldn't the bus speed be handled by the IMC on the cpu itself, along with the memory division, and final multiplied clock speed? I figured it would all be self-contained on the IMC, while the traditional NB handled the multplied NB Frequency to the rest of the components.
NCspecV81, in retrospect with Socket 939 the reference clock speed (ie. 200Mhz) was all on the motherboard (chipset). I'm not entirely sure how it is with Phenom processors but I'm assuming the same applies. The IMC is the memory controller which should be separate from the reference clock speed or HTT.

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post #676 of 2829
Quote:
Originally Posted by gsk3rd View Post
does bus speed increase cpu performance versus multiplier?

i dont think so, since in the am2 era the performnce was practically the same. the frequency is what matters in amd chips.
    
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post #677 of 2829
Quote:
Originally Posted by gsk3rd View Post
does bus speed increase cpu performance versus multiplier?
I really don't think so, the reference clock is just that, a reference so if everything else is kept at stock (through multis and divisors) then the reference clock shouldn't effect performance at all. Unless the reference clock is tied to something else as well besides the CPU, RAM NB and HT link? Possibly a SB clock? I dunno, but I'm pretty sure that if everything else is compensated for by lowering multis and divisors, then you could just keep raising the ref. clock without any consequences-- although at some point even the reference clock generator will become unstable. Although I would love to be proved wrong.

If someone could bench with equivalent settings with a low reference clock and then with as high a reference clock as possible while keeping all other speeds the same we could figure this out.

I'll do some benchies tonight too after work to see what the deal is.
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post #678 of 2829
i did 250 x 15 and 200 x 18.5 and got almost the same score in 3dmarks06. i also had to add a lot morejuice to get 250 x 15 to work.

also rotary i reall saw no difference with mu uk at 1k rpm and 3k rpm.
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post #679 of 2829
Add me to the list Please.

Hey Guys Got my First 100% Stable OC today on my 940. Right now its @ 3554 with a max temp of 59/60 running OCCT 1 HR.

Is this Temp too high for OCCT stress test?

I have been able to go higher but not keep it stable and Temps are scary! Any tips or Ideas would help.

INFO:

Stepping: CACV AC 0850BPCW
MB: Crosshair II Formula
BIOS: 1210
Multi: 17.5 FSB: 205



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post #680 of 2829
Quote:
Originally Posted by pun3D View Post
i did 250 x 15 and 200 x 18.5 and got almost the same score in 3dmarks06. i also had to add a lot morejuice to get 250 x 15 to work.
Pun3D, did you run any other benchmarking utilities to see if there was a difference? Would Sandra constitute for some decent benchmarking?

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