AcidHardware decided to do a little comparison shopping for you. Head on over and check out their latest PC2100 DDR Round-up. They dare to compare PC2100 sticks of RAM from OCZ, Mushkin, and Crucial. here's a snip:

"DDR RAM whilst only offering about a 15% performance increase over SDRAM has seen a surge in popularity ever since its mainstream integration on the original Nvidia Geforce 256 graphics card. Ever since then, DDR has only really been seen as an option for AMD equipped systems. Although there has been the option of the VIA Apollo Pro 266 chipset which allows you to utilize DDR ram on Socket370 motherboards it has yet to catch on."