Memory Problems - Asus P5W-DH Deluxe

When i first built my pc i bought a matched pair of 1GB sticks PC2-6400 (Kingston). They where being reported at 5300 for some reason.

I have now changed them for a matched pair of 2GB sticks (OCZ) PC2-6400 and the same thing happens.

If i try to force the bios to see them as 6400, it will say my Core 2 Quad 2.4GHZ is only 2.13Ghz. Does anyone know what settings to use, the ram is 5-5-5.

If i overclock my pc will work fine for a day or two then just suddenly not allow you to turn it on. when you eventually get it to POST it will say overclocking / overvoltage failed.

Also i cannot get windows XP Pro 32bit to recognise 4GB RAM, only 3.2GB, is there a way round this at all?

1 - Is your cpu Q6600?

http://processorfinder.intel.com/d [...] spec=sl9um

2 - Generally, 5-5-5-15 is the sweet spot for any speed under 1000mhz. Some ram can do better. Look at your kingston chips closely. If there's a D9 prefix, you're golden. They can be overclocked like mad.

http://www.virtual-hideout.net/rev [...] hkin09.jpg

3 - The post failures may have to do with that particular board, unless the ram settings are wrong.

4 - No, you can't get around the physical memory limit in 32-bit os. Upgrade to 64-bit for 4gigs or more ram.

You have to set up bios for ram faster than 800mhz or else the mobo will set a standard specs like 800mhz. This way, the mobo will work with any ram.