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I found some ram I would like to buy online but I would like to know if it's compatible with my system

Motherboard is a Dell optiplex 745  and the current ram in it is 512mb 1Rx8 PC2-5300u-555-12-D3. And the ram I want is 8GB Kit 4x 2GB PC2-6400U DDR2 800MHz 

can someone tell me if it's compatible with my motherboard

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judging by the spec sheet I found online, this kit should be compatible unless you have the model with two ram channels. If you want to do some extra digging look up Intel® Q965 (ICH8) Express Chipset and the optiplex datasheet.

Edited by eeeee1
Realized not every model has 4 channels

PC specs:

Ryzen 9 3900X overclocked to 4.3-4.4 GHz

Corsair H100i platinum

32 GB Trident Z RGB 3200 MHz 14-14-14-34

RTX 2060

MSI MPG X570 Gaming Edge wifi

NZXT H510

Samsung 860 EVO 500GB

2 TB WD hard drive

Corsair RM 750 Watt

ASUS ROG PG248Q 

Razer Ornata Chroma

Razer Firefly 

Razer Deathadder 2013

Logitech G935 Wireless

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