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P4M800P7MB RS2H Foxconn motherboard and 2G memory upgrade

\015 Please helpI've got the following:CPU name: Intel(R) Celeron D CPU 2.66GHzMotherboard model: P4M800P7MB-RS2HBIOS Name: Phoenix- Award V6.00 (584F1P12)Memory device: 512M DDR2OS:Windows XP Home+SP2I've got two 512M DDR2 RAM in the memory slots at the moment. I replaced it with two 1Gb DDR2 800's , but it registered only as 1Gb total memory with both cards in position. When I removed one of the 1Gb cards, it registered as only 512Mb memory. I got the same results with the other 1Gb card.According to the motherboard's manual is support up to 2Gb. It also support DDR2 533/400. The shop where I bought the 2Gb's said it will work with the motherboard, but the speed will not be 800mb, but 533mb which is understandable. The PC boot normally and so does everything else, except that the RAM is only 1Gb where it should be 2Gb with the two 1Gb cards.\015

Answers :

The 1gb memory modules need to be low-density ie chips on both sides. the motherboard can only recognise 512mb on each side of the memory module.
I went back to the shop where I bought the RAM - they haven't got slower RAM. There they replaced these two DDR2 1Gb 800 with equivalent RAM. The only difference being the set causing the low RAM value of 1Gb is a Samsung make and the the set of which the total RAM is 2Gb, is a Transend make. Everything is working now 100% ok

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