OCZ Technology recently unveiled PC3-16000 4GB (2x2048MB) DDR3 kits for those needing high-performance memory. These join existing 2GB modules of similar design.
The OCZ DDR3 PC3-16000 Platinum Edition kits combine two 2GB modules for 4GB system density running at 9-9-9 latencies and a 2GHz data rate, according to OCZ. They reportedly achieve this at 1.9V.
OCZ is adding a a 4GB kit option to the PC3-14400 Platinum Series as well, for users taking advantage of 1800MHz speeds on the latest motherboards. Both should be available now.