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post #2261 of 5037
Quote:
Originally Posted by iSeries View Post
@ Headless Fansprings - many thanks for the links. The first link is where I'd read that CPUNB should be (CPU speed x 2) / 3.15.

Just to clarify, here are my exact settings currently:

CPU: 3500mhz (250 x 14) @ 1.3v
CPUNB: 2250mhz
HT: 2000mhz
RAM: 1665 (65mhz above spec) with timings of 7-8-7-20 @ 1.65v (as per their spec).

Are you saying I should be reducing the speed of my RAM? With the above settings I ran Prime95 for 4 hours with no errors, with a max CPU temp of 53c.

Also, if I needed to give a little more voltage to my CPUNB (if I decide to raise it to 2500mhz) what is the correct voltage to raise? (In my BIOS there is 'Northbridge Volt Control' and 'CPU NB Vid Control'.)
Should you wish to overclock your system further, you really have no choice. It appears to me that you can tigthen your timings to 6-6-6-14-1T, raise the reference clock to 280 and run your RAM at 1492 MHz. You should also set the NB link frequency to 2800 MHz, the CPU VID to 1.4 V and the CPU NB voltage to 1.35 V for optimal performance. With the higher NB link frequency, you will get considerably more out of your RAM. My PC3-10666 RAM posted at 1800 MHz, but I surely would have had to loosen the timings and raise the voltage to gain stability in Windows. In my opinion, you are better off with the tight timings.
Edited by Headless Fansprings - 8/27/10 at 3:56pm
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post #2262 of 5037
just been playing around, any suggestions/comments?
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post #2263 of 5037
Quote:
Originally Posted by Phobos223 View Post
Best way would be to rock memtest86 for a few hours. I can't remember what the limit is, but I know you have to get 2 instances going to test 4GB of ram.... somthing like 1800 MB each or something... google it and you will see.

Anyways, if you can run that for a few hours with 0 errors, you should be good to go. After that maybe do a prime blend for a bit but thats just for good measure!

Also since you going ~200mhz less than rated speed if those setting are stable might as well shoot for CAS 6 if you can! Worst case scenario you Bsod and reset back to 777-18
Ok thanks man I'll do some googling.
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post #2264 of 5037
Hi, im new here, and sorry for my terrible English.
Im new to O'C and here is my setup.
FSB/Multiplier:235/14
CPU Speed:3300
NB Speed: 1771
CPU Voltage:1.236
CPU-NB Voltage:1.15
RAM Speed:943
Motherboard:M4a89td pro
Model: (125w or 95w) 125w
here is

I have few questions, first, i dont know how to pass 250fsb, i'v tried 1.47v, 1.5v but it just doesnt work for me, is it because my ram is the cheap Corsair Value Select VS2GB1333D4?
but my cpu is working so fine on low voltage, currenty 1.23-1.248v at 3.3g, Cpu/Nb 1.15, Dram 1.5, VDDa 2.5, Nb 1.1 NB 1.8, Ht 1.2, Sb1.1, prime95 12hrs with highest 42C temp, but no matter how hard i try, i just cannot pass 250, can any pro help me with that?
my build is
M4a89td pro
1055t
180g wd blue
500w earthwalt antec
antec coolerbox
Corsair Value Select VS2GB1333D4
HD4350


im thinking of an upgrade of my hdd to ssd, will it improve my system a lot?
thanks for any information.
Edited by lionthewanker - 8/27/10 at 5:59pm
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post #2265 of 5037
Think im going to need better cooling, im overclocked to 3.9, idle i run at 32C, but using prime95 i reach 53C as shown by CPUID HWMonitor.
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post #2266 of 5037
Scott: what are your ambients?
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post #2267 of 5037
So I'm running Prime small FFT right now to check CPU voltage stability @ 4.0ghz.

1.425 failed after the first calculation pass. (~50 seconds).

1.45 (shows as 1.44 in CPU-Z) is rolling along and has made nearly 30 minutes without issue.
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post #2268 of 5037
Quote:
Originally Posted by Metonymy View Post
So I'm running Prime small FFT right now to check CPU voltage stability @ 4.0ghz.

1.425 failed after the first calculation pass. (~50 seconds).

1.45 (shows as 1.44 in CPU-Z) is rolling along and has made nearly 30 minutes without issue.
Yeah I couldn't do it at 1.425 either. I am at 1.45 as well.
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post #2269 of 5037
Quote:
Originally Posted by Kamakazi View Post
Yeah I couldn't do it at 1.425 either. I am at 1.45 as well.
I just realized how similar our setups are, even down to the graphics card.

Would you mind PM'ing me the rest of your voltages? (RAM, NB, CPU/NB, VID)?
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post #2270 of 5037
So it looks like my CPU is stable at 4.0 while using 1.45V (stress tested in Prime via small FFT).

Onward to tweaking the rest of the settings to ensure stability during blend...

http://valid.canardpc.com/show_oc.php?id=1365176

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