My brother gave me his spare 2gig ram, the brand is transcend and it is ddr2 675 or something mhz, while my existing installed 2gig RAM is a Kingston brand and it is ddr2 800mhz...

Can I install the spare ddr2 2gig ram of my brother?

Will I not experience Blue Screen of Death?

Or worse, my pc would explode, is my fear valid....