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My HP laptop had 2 GB, so I wasn't sure to upgrade with additional 2GB as I read in some cases people faced issues when they upgraded to 4GB, so I opted for 1GB to be on the safer side. RAM is working properly on my laptop but did help much with the speed issue, I guess you can not blame the RAM (my laptop -> Win7, 3GB RAM, core2duo)

Laptop I was dealing with had 960GL motherboard; so 553MHz chip was needed which was out of stock. So I ordered 667MHz and yes, it works just great. Don't underestimate this product for the price tag; RAM is seated smoothly and the initial lags of 1 GB RAM are no more there. Currently running Win10 and 1.2 GB RAM is used. Yes, I have virtual RAM more than 1520 GB, still, have them in pairs is the best way to operate the system. My other RAM is Kingston 800 MHz at 1.9V. But they both are working fine. I truly appreciate this product from Simmitronics.

Its working very nice. The quality of the product is very nice. It is the best 2gb ddr2 667mhz ram as compared to the rest 2gb ddr2 ram. I will order this item again.

Difficult to get in market this is good for old desktops. Sealed packed new condition in perfect working order.

Awesome product. So far so good. Performs great so far.