Overclocking problem...

[CLohre]

Okay I have succesfully figured out my max safe FSB/HTT can go up to 300. I also figured out that my AMD 64 3000+ can get up to 2.4 GHZ my problem is that if in my bios I set the proper HTT/FSB, CPU Memory and HT settings my computer dosn't post just hangs and I have to reset my CMOS.

What I set it to is 300 HTT/FSB, CPU Multilplier 8 set memory to 133 amnd HT at 3.

My motherboard is a K8N Neo2-F and I can't change my memory timings to anything other than 100,133,166,200 and Higher.

 

[fireontheway]

Originally posted by: CLohre

My motherboard is a K8N Neo2-F and I can't change my memory timings to anything other than 100,133,166,200 and Higher.

Those are dividers.

 

[CLohre]

Yes I know they are dividers, I was just saying that my motherboard dosn't support that many. Becasue there are so nany choices for settings which I can't try becuase of the mem settings.

Okay so those settings above are a little too zealous I have changed mine as of right now to 256 HTT/FSB, 9xCPU, 166RAM, 3 HT which gives me a very stable 2.3 GHZ, an overall 500Mhz imcrease from my stock 1.8GHZ.

I see in you spec that you have your 3000+ at 2.6, did you try overclocking before you got your new HSF? and I f you did what were your results with the stocj HSF and what is your voltages for your cpu?

 

[fireontheway]

Sorry, my sig was outdated.My current settings are 278/ 9X/133 @2.5 3 3 7 V DIMM @2.6V /3X HT..I clocked it down beacuse it needed a lot of voltage just for a 100mhz increase(which i now think is ridiculous).With the XP-120 the CPU idle temp is @30C / 1.40V. Sorry i cannot give you exact numbers for the retail fan,it's been too long since i last used it but it will most likely give you a bit higher reading.

 

[kmmatney]

Looks like you did things right:

Memory at 133 mhz
HTT multiplier at x3
Set FSB at 300 MHz

--> That will get you a 50% overclock, for 2.7 GHz I think. That is probably too ambitious.

I think you should be able to hit 2.4 GHz, can you up the FSB just a little more?

 

[Zap]

Knowing that you can hit 2.3GHz, now find out what your board/RAM can do by lowering the multiplier to something like 5X or so - take the CPU completely out of the equation.

What about running 290x8? That's "close enough" that it may work.

 

[CLohre]

Thats the funny part... I lowered the CpU multiplier to x5 and the memeory to 100 and tested he FSB in 5 mhz incremnts till I hit 300 each time I did so it booted normally. The problem seems to come when the 3 come together. My Memory is 1gb Kingston ValueRAM x2/512 sticks. Memtest read without errors up to 209 mhz (DDR416) on the ram and I was able to clock up to 2.4 GHZ on the CPU with Mem at 100 and Ht down low.
The catch putting thse togther results in No post..

 

[Furen]

I'd try losening the memory timings a bit. It may be that your mem controller just can't take the clock speed.

 

[GuitarDaddy]

Sounds like the ondie memory controller on the CPU is holding you back. It can handle 300mhz with the divider at 100, but not 133.

I would suggest you try

270x9 with the 133 divider, and go up from there if you can

 

[CLohre]

Okay I tried what you said and it worked. It set my system to 2430 GHZ but but then crashed after a little while with a BSOD. So I changed the settings too 267x9 and a 133 Mem and it worked great at 2403. Although my memory timings were rather LL but my bandwitdh was horrible.

I then brought the mem up to 166 and it and memtest said it would run at 222 Mhz at DDR445. I am now runnig memtest to see if my system will be stable and I don't fry my ram. what would be a good HT setting? I had it at x4 with the 133 divider and it gave me a wopping 171 Mhz and DDR 343 and a HT speed of 1067. Bringing the memory up to 166 won't bring the HT too hight will it? and if so would HT 3 be better?


UPDATE: This is what I am right now 267x9 (2.403 GHZ), 166 (218 mhz, 437 DDR), HT x3 (800) running stable.

 

[Zap]

The memory setting and HT multiplier are separate. The HyperTransport bus is specified at 800MHz with socket 754 CPUs, that's 4x200MHz. Socket 939 CPUs are 5x200=1000MHz. Socket 754 CPUs/mobos can usually work up to 1000MHz and I've seen socket 939 work pretty easily up to 1200MHz. Of course YMMV. Also, there doesn't seem to be too great a performance hit if you dip a bit below rated speed. Basically whatever you end up setting system bus speed to, adjust the multiplier for HT so that the resulting frequency is between 700-1000MHz for socket 754 and 800-1200MHz for socket 939.

An example would be at 300Mhz on socket 939, setting HT to 4X will give you 1200 which is probably okay on most boards. If you have problems, then set to 3X will give you 900MHz which will work without any noticeable performance loss.

For memory multipliers:
133 = 2/3
166 = 5/6

You'll want to know what your memory can do, and then adjust the setting appropriately for your system bus speed. The math is:

BUS_SPEED x MULTIPLIER x 2 = DDR_SPEED

For instance, if you set system bus to 300MHz and...
memory set to 166
300 x 5/6 x 2 = DDR500
memory set to 133
300 x 2/3 x 2 = DDR400