New Pc4000 Memory

[pbrennan10]

I just bought some new pc4000 ddr memory.

512mb Kingston HyperX 500 mhz

 

to work with my old:

 

512mb Kingston HyperX 333 mhz (pc2700)

 

My motherboard doesn't support PC4000 but i was thinking it seems like i could just underclock the ram to run with old ram. Anyway it doesn't work, i get some bios error when i try to start and the horrid bios beeping. I've tried setting the ram speed in bios preemptively but this doesn't work either, is there something else i have to do to underclock it?

 

I'm also aware this seems like a waste of money but i got this pc4000 for cheaper than the pc2700 so =)

[DarqFlare]

Hmm. I can't think of anything to help you out... But let me put it this way:

 

I don't think two different clock speeds of RAM will work together on the same board.

 

I've got 2- 512MB Hyper-X sticks as well, but I forgot the clock speed.

[TCH-Rob]

I don't think two different clock speeds of RAM will work together on the same board

Not entirely true. I do not know about the new stuff that comes out but you could run two different speeds before, you could only go as fast as the slowest stick though.

 

This is what concerns me;

 

My motherboard doesn't support PC4000

 

I will let one of the real hardware gurus come and look at this but I am not sure if there is a way around this.

[pbrennan10]

It was the cas latency and that line of stuff.. I had to slow them down considerably. they're both working together fine now.

 

It seems like since the 2nd stick is running at such a low speed it could pull a low cas latency though.

[TCH-Dick]

what mobo do you have and which slots do you have the ram in (doesnt matter if the mobo doesnt support dual chanel)

 

latency isnt going to be thet great since you are running two different speeds of ram, whatever the cas on the 2700 is will be the cap on it. If your mobo allows it you can tweak the voltage to the memory, and could possibly get the 2700 up to 400mhz FSB.

 

Also, what is the FSB on your cpu? If you are running the ram out of sync with the cpu that can also affect your latency.

[DarqFlare]

Ahh. Real answers, lol...

 

I had to sync my RAM and CPU...

[pbrennan10]

I have an epox 8rda+

Athlon XP 2400+

 

I'm currently running at 166 FSB.

I tried to run ram at 120% of FSB to get 400 mhz DDR and it wasn't smooth.

The problem with timing is, previously i had the pc2700 running at 2-2-2-5.

Now with the SAME mhz i'm running it at 8-3-3-3. And i get a checksum error when i try to go any lower.