I have a Dell Optiplex 745, how can I find out the range of CPU's and RAM it will take ?
Depends on which model you have. The USFF is the least upgradeable due to the smallest power supply and only 2 Ram Slots instead of 4.
Bios Should be updated BEFORE trying a new CPU.
Intel® Core™2 Duo Processor E6700 (4M Cache, 2.66 GHz, 1066 MHz FSB)Intel® Core™2 Duo Processor E6600 (4M Cache, 2.40 GHz, 1066 MHz FSB)Intel® Core™2 Duo Processor E6420 (4M Cache, 2.13 GHz, 1066 MHz FSB)Intel® Core™2 Duo Processor E6400 (2M Cache, 2.13 GHz, 1066 MHz FSB)Intel® Core™2 Duo Processor E6320 (4M Cache, 1.86 GHz, 1066 MHz FSB)Intel® Core™2 Duo Processor E6300 (2M Cache, 1.86 GHz, 1066 MHz FSB)
Memory Type: DDR2 PC2-5300, DDR2 PC2-8500, DDR2 PC2-6400, DDR2 (non-ECC)Maximum Memory: 8GB Slots: 4 Each memory slot can hold DDR2 PC2-5300, DDR2 PC2-8500, DDR2 PC2-6400 with a maximum of 2GB per slot.*
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Thanks for your reply. The model i have is the 745 desktop (not USFF, SFF or mini tower).
What can be done is listed above.
It was taken from the spec sheet.
Dell™ OptiPlex™ 745 Tech Specs
If you have a 32bit version of Windows (almost all Windows XP were 32bit, Vista and 7 could be either 32 bit or 64 bit versions) then Windows will not be able to address any memory over 4gb. In fact from the 4gb of addressable space other memory space such as the amount of memory on the video car is subtracted from this maximum addressable space. Take this into consideration before spending money on memory that you version of Windows may not be able to take advantage of.