There is free software for wi dows that will test ram...the standard software most peopke use is memtest86+. It is free....the issue and difference a stand alone tester like ramcheck does is a more component level check AND it is much faster. Using a motherboard and windows you have to reboot each set of ram you want to test...so at most you can generally check 8 sticks if you have a dual processor server board at a time...with a reboot between each. The ramcheck does a stick every 15-20 seconds I think it is. You also just change out the port for different memory rather than needing a setup for ddr ddr2 ddr3 sodimms ect.

Just saying...if you test alot of memory...ramcheck lx is the way to go...but break out the checkbook...