PC800 vs PC1066?

[Guest]

Upgrading a friend's pc's memory. Dell Dimension 8250.
He has 2 slots with 256MB each and 2 free slots. I'd like to upgrade to 1GB or 2GB but am unclear about PC800 vs PC1066.

Here's what was recommended:
Memory Size Chip Description Part Number Price OEM Part#
256mb PC1066 Kit 256mb kit 2Pcs of 128MBx16, 1066MHz PC1066, 184p 563ms-563
$46.95 In Stock
256mb PC800 kit 256mb kit 2pcs of 128MB, 800MHz PC800, 184p RIMM, RDRAM, 40ns 575ms-575
$32.95 In Stock
512mb PC1066 Kit 512mb Kit 2Pcs of 256MBx16, PC1066, 184pin 567ms-567
$79.95 in stock
512MB PC800 40ns Kit 512mb Kit of 2pcs 256MB 800MHz PC800, 184p RIMM, RDRAM, 40ns 576ms-576
$52.95 In stock
512MB PC800 ECC Kit 512mb Kit 2pcs of 256mb Rdram Rambus 184p RIMM, ECC, 533 Bus speed 40ns 579ms-579
$54.95 Best selling item
1Gb kit 2x512mb 1Gb Kit of 2pcs 512Mb, Rdram Rambus 184p RIMM, 533 Bus speed 40ns 577ms-577
$179.95 In Stock
1Gb ECC kit 2x512mb 1Gb Kit - 2pcs of 512MB Rdram Rambus 184p RIMM, ECC, 533 40ns 581ms-581
$179.95 In Stock
1GB PC1066 Kit 1GB Kit 2pcs of 512MBx16, 1066MHz PC1066, 184p RIMM, RDRAM, 2.5v 569ms-569
$299.95 In Stock
1GB PC1066 Ecc Kit 1GB Kit 2pcs of 512MBx18, 1066MHz PC1066, 184p RIMM, ECC, RDRAM, 2.5v 570ms-570
$299.95 in stock
512mb PC1066 Ecc Kit 512mb Ecc Kit 2Pcs of 256mb Ecc PC1066, 184p RIMM, ECC 568ms-568
$89.95 In Stock
256mb PC1066 ECC Kit 256mb Ecc kit 2Pcs of 128MBx18, 1066MHz PC1066, 184p RIMM, ECC, 564ms-564
$32.95 In Stock
512MB PC1066 Kit 512mb Ecc Kit 2Pcs of 256mb Ecc PC1066, 184p RIMM, ECC 568ms-568
$89.95 In Stock

Thanks!
John

 

[saint19]

Hi newcomer and welcome to the Tom's hardware forum.

Go with 4x512MB 800MHz u won't see a big difference between 800MHz and 1066MHz.

 

[webpro2k02]

Looks like With a 1066MHz memory this system motherboard will only support max of 1.5GB, with 800MHz it should support upto max of 2GB?

Maximum Memory 1.5 GB(PC1066) to 2GB(PC800)
http://www.memorystock.com/memory/DellDimension8250.html