Overclocking AMD 4000+

[Merlin]

Hi guys Im looking for some comments/suggestions on my attempt to overclock my system. I want to see how far my PC can go without changing any of my voltages and remaining stable.

Hardware im using:

AMD 64 4000+ San Diego Socket 939 (Stock @ 2.4GHz) with CoolerMaster Hyper48 Heatsink & Fan
DFI LanParty NF4 SLI-DR EXPERT Motherboard (BIOS v0.7)
2Gb Corsiar XMS 3500LL Pro RAM (rated 2-3-2-6 1T @ 433MHz)
Enermax Liberty 500W Modular PSU


To start with it set my memory to 3-4-4-8 2T with a FSB : DRAM ratio of 1 :1 and set my CPU multiplier to X6 to see how far I could push the FSB. Any FSB over 200 required me to set my HTT multi to X4 to remain stable. I easily got to 250, running Memtest86 (comes pre-loaded with DFI Mobo's :cool:) to see if it was stable. However, having the FSB set to 255 caused my PC to stop booting. I tried lowering the HTT multi to X3, but still no joy PC wouldnt boot. I couldnt be bothered to check every MHz from 250-255 to I set the FSB to 251 to see if it was the HTT multiplier that was causing the trouble, but It booted into memtest and was stable so I left it there.

I had no problems with overclocking the processor, After running each with Prime95 this is what I got:

251FSB X 10 = 2510 CPU temp idle = 31C, CPU temp max = 39

251FSB X 11 = 2761 Exactly the same temps

Picture taken during Prime95


I have a big problem though, If you look at the picture above you will notice that the memory frequency is running at 230Mhz (well below what it is capable of. I know what the problem is but Im not sure what is the best way to get around it. The memory frequency is locked to one 12th of the CPU speed:

Memory frequency = (FSB X CPU multiplier) divided by default CPU multiplier (im my case 12)

This could be negated through only using a CPU multiplier of X12 but then I would not be able to use my RAM to the maximum because I doubt my CPU could run at 3GHz without upping the voltage.

OR

Should I try using a differnet FSB : DRAM ratio? 5 : 6? Would this work if the memory frequency is locked to one 12th of the CPU speed?

Should I establish the maximum speed my memory can achieve with a mixture of timings first, and then see what I get out of the CPU?

As I said before any comments/suggestions would be appreciated.

 

[Matt555]

I have a big problem though, If you look at the picture above you will notice that the memory frequency is running at 230Mhz (well below what it is capable of.

That's actually 460MHz. (230MHz x 2)
It's DDR RAM don't forget.

 

[Willz]

well, on my motherboard i got some sort of cpu:memory ratio, if i did not change it, my memory would be running at 520mhz, not possible, so i change it, i am running at 2.8ghz (1.45V) memory at 420mhz (210mhz x 2), my FSB is at 254mhz and HT at 3x.

You should try using different FSB: DRAM ratio, i would of thought there would be some sort of CPU:Memory ratio on that board, i think you will be able to get your cpu to 3ghz 100% stable with a voltage bump, and maybe even 3.2ghz, but thats your max, voltage will start shooting up.