ASUS P4PE motherboard, RAMs allowed

[LuckyDutch]

I have installed 2 Memory Modules on my P4PE board: in Row 0&1: 512MB, DDR, PC2700U,166MHz(Infineon) and in Row 2&3: 512MB, DDR, 333 (Infineon). I want to extend my memory to 1,5 GB and bought SPE 1024MB DDRAM PC333. I repaced my Row 0&1 card with this 1GB card. Nothing works! Have I choosen the wrong memory? If I go back to the old 2x512MB configuration, all is fine again.
Please help me with some insights!

[yahooadam]

It should work ok i think

Does the 1gb stick work on its own in the board?

[Zefram]

My guess is that the RAM timing is mismatched (as the result of the mixed SPD setting)

But, as usual, make sure you check the RAM as yahooadam pointed out - gotta make sure you weed out potential damaged hardware before digging the more advanced options :D

[LuckyDutch]

Thanks yahooadam! Very usefull advice.
I should have tried this out. But.., I have already returned the "wrong" RAM to the supplier and bought another one with description exactly identical to the one in my P4PE manual: "Kingston ValueRAM - Memory - 1 GB - DIMM 184-PIN - DDR - 333 MHz / PC2700 - CL2.5 - 2.5 V - unbuffert - non-ECC"

I have little ideas what these descriptions mean. I found this site: "http://www.mpasystems.com.au/cgi-bin/mpa.pl?04_support+89_RAM%20Explained" and learned something about RAM.

Thanks also Zefram for your reply!
Do I need to change entries in my boot settings? What means "SPD setting"? Any idea where I might learn more about how to do correct or get best settings for my RAMs?

Great to usefull help for my computer problems!!