If you're going to run them at stock speeds, you won't notice any difference. However, the differences become apparent when trying to overclock with no name RAM. It's hit or miss. Also, you'll find that some of the name brand uses better chips that can run DDR2 1066 with only 1.8v vs the 2.0-2.1 that his requires which probably means 2.1 or higher.
They will be at stock speed. They are for my two nephews computer. I'm doing upgrades for them.
Is it a custom built computer i.e. does it have an after market motherboard in the machine? The reason I ask is because if it's not, you'll have to check their motherboard's specs to see what voltage it runs RAM. Because the BIOS will be locked, you can't bump up the volts to the 2.0-2.1-2.2 this will require and thus it will only run at whatever speed it has set in it's profile for 1.8v
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