One can buy memory stick Pro Duo 4GB unit at in store electronic shops such as Best buy, Future shop, Staples, Office depot, Sears, Walmart, Target, Amazon online, eBay online and Home Depot shop.
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PSP memory card costs depend on the size. Expect to pay from $50 to $100 for a 4GB stick. A 2GB stick can run from $35 to $60. Evaluate your need before your purchase and shop around.
Stores such as Walmart, Best Buy, Target, and GameStop sell 4 gigabyte memory sticks for Sony's PSP game system. The memory sticks are also available online from websites such as Frys, Amazon, and eBay.
I Don't think so cause the C650 have just about 64MB real Memory of gaming memory and the shared memory can up to 1635 MB With 4GB memory and with this 4GB memory the rate of windows 7 for graphic is 4.6 that didn't exactly play So Much Game ...
In the hardrive in the console.
It depends on if you have other things on your r4 then it take memory for that