Need help with an A64 X2 OC

[slirp]

I could really use some help because for the life of me I can't figure out what's going on. I bought a 3800+ X2 Manchester to replace my 3000+ winchester. I can't seem to be able to raise my FSB and my memory clock at the same time. Here's what I mean. I have 2GB of PC4000 which I've always kept clocked at its stock 250Mhz with 3-4-4-8 timings. With my memory clocked at 250Mhz I can only push the processor to a HTT(FSB) of 210Mhz at 4x HT. Even then it's not really stable. Yet if I clock the memory down to 200Mhz and add a little juice on the CPU voltage I can push the HTT to 250Mhz and boot in to windows. I never ran prime to see if it was stable but it seemed okay. Has anyone run in to this before? Can anyone offer a little advice?

Here's my setup:
MSI K8N Neo2 Platinum (Bios at v1.B)
2GB Corsair XMS PC4000 at 3-4-4-8
A64 3800+ X2

Thanks for any advice

 

[txtmstrjoe]

What are your exact settings, please? (CPU multi, RAM divider, etc.)

Also, how methodical have you been when it comes to overclocking?

 

[slirp]

utimately I'd like to be able to run my CPU and memory 1:1, I've had the mem up to 267Mhz stable.

I've kept the mult at 10x perhapse that's where I went wrong. With my memory at 250Mhz i've been able to boot at 210x10 with 4x HT. With the memory at 200 i've been able to boot 240x10 still 4x HT. I'm pretty cautious about stepping up the FSB I do it in 5Mhz increments till no post then I back up and do one at a time till I find the ceiling.

This is only my second A64 and I'm still trying to get the concept of the HT x HTT but mem clock is now something else. I miss the old days of being able to just set a fsb and mult with some jumpers and let her rip.

I'm also a little hesitant to keep bumping the voltage. It just seems like not matter what I do I can't get the thing stable. I guess ultimately I'm starting to wonder if I didn't get a bum chip.

 

[tersome]

Memory speed equals HTT x Memory Divider. 250mhz in BIOS is generally the 5/4 divider. 200mhz is generally the 1/1 divider. With 240mhz HTT, 250mhz memory in BIOS gives you 300mhz ram, while 200mhz memory in BIOS gives you 240mhz ram.

It's confusing.