Hi all, just been wondering for awhile about this BSoD I catch randomly after installing two 1Gb PC2-5300 667 RAM. Previous RAM being 512Mb PC2-4200 533. The BSoD just happens suddenly at random times whilst browsing around my computer with the 1Gb RAMs installed, the errors seem to be memory related I guess (BSoD showing stuff like IRC Not Equal or Less, Non Paged File or something and so on). Having the 512Mb RAMs in the machine has no problems at all (except programs freezing and crashing up >_>, PF usage hitting near to top as displayed on Task Manager). The 512Mb RAM CL being at 4-4-4-12, whilst this 1Gb RAM hitting the 5-5-5-15 me thinks (even though I read and told that its 4-4-4-12, my BIOS has no option at all to set the DRAM speed or whatever RAM setting...Acer Aspire T650 ~_~....guess some settings are hidden away...eehh...I assume it just picked whatever setting it can do and that its on "Auto"). Currently using the 1Gb RAMs (no BSoD as of yet), until I think the PF hits over the 1Gb mark or so. Any suggestions, explanations or directions to where I go from here? Currently thinking whether purchase a DR2-553 1Gb x2 instead, or sticking a lower one in the DIMM0 bank then the 1Gb one in the DIMM1 bank and see if picks the lower setting and apply to both? Gah....no idea where I'm heading with this. ~confused for nows over this~ ----- Oh and my computer specs for more detail: Acer Aspire T650 System with a few things changed. Current specs: Windows XP MCE SP3 DualCore Intel Pentium D 2800Mhz NVIDIA GeForce 9500GT 512Mb Acer Motherboard with AMI BIOS Corsair 550w PSU Acer 512Mb RAM PC2-4300 533 x2 (switched it back from the RAM I had which was GEIL 1Gb PC2-5300 667 x2 as of BSoD occurance again) Western Digital 240Gb SATA - Master Maxtor 160Gb IDE - Slave ---------------------------- Motherboard BIOS in more detail: BIOS Type: American Megatrends BIOS ID: 63-0100-000001-00101111-060206-RS400 BIOS Vendor: American Megatrends Inc. Manufacturer: ACER Product: Aspire T650 Base Manufacturer: ACER Ehh.....possibly I need to update it? Having difficulties locating the BIOS update for this...maybe updating will solve the current issue I have? x_x ------------------------------- Hmmm...now I wonder am I posting in the right thread even since its a mixture of "Processors, Chipsets and Motherboards" section and "BSoD" here with the errors. Checked my motherboard and its said to be compatible with 667, 533 and one other lower one...still wondering why it BSoDs from using a 667 RAM...ehh...max capacity of 2Gb it can hold.