TFT

Cmon chaps, explain why.
Motherboard - ASUS P5KPL runs ok with 2 sticks of 1GB DDR2 ram in the yellow slots A1 and B1 and running in Dual Channel.

So I ordered from Crucial what I thought was 2x2GB sticks but what arrived was 4x1GB sticks. OK I thought I would populate all four slots but on booting, the BIOS recognised the 4GB but refused to load windows with just a black screen to look at.
I went back to 2 sticks and everything was fine, added one more to make 3GB and it booted into windows fine but after a minute or so shut down with a memory error.
Why have four slots if I can't populate them with matched dimms.

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Operator: Dave
Operating System: XP Professional SP2
Processor: Intel E6750 Core Duo@3.20GHz
Graphics: Nvidia 8500GT
C: Drive 500GB
D: Drive 200GB
Memory: 2GB
Monitor: 22" Widescreen
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Winner of Photo Tournament - Eerie, Dark, Creepy--etc.