WWW. .COMHOME  | BUY MEMORY |   | BUY SECURITY|  | MOTHERBOARDS |  | LETTERS |  | EMAIL | For questionsabout your generic "PC-100" mother board please try your mother board manufacturerat http://www.pcchips.com/   or the vendor that you purchased it from. PC-100 is a specification, nota brand name. Myth: There is no economical way to protect from malicious hacker attacks. | click here for the truth |PC133 PC2100 PC1600 RDRAM  What do all the new names mean? PC133 SDRAM is just about the same as PC100 SDRAM except for the bus speed is 133 MHz instead of 100 MHz. That is about one third faster. A CAS latency of 2 is pretty much standardfor most PC133 memory. Memory with a CAS 3 latency is a few per cent slower than CAS 2 memory. PC 2100 is the DDR (double data rate) version of PC133.PC1600 is the DDR version of PC100. PC2100 is only a few dollars more thanPC1600 so it gives you the most value for your money, even if you are goingto put it with a motherboard and CPU with a front side bus speed of 200 MHz fornow. The effective speed of double data rate PC2100's 133 MHz clock is 266MHzbecause data is transfered on both the rising edge and the falling edge ofthe 133 MHz clock. As far as RDRAM goes, just say NO. The only way to getany real speed out of RDRAM is to use a bank of four modules. As if theywern't expensive enough one at a time. The latency of RDRAM is so horriblylong that in most stuations it more than eats up any clock speed advantage.One of the worst features of RDRAM is that it can only transfer 16 bits ata time (16 bits = two 8 bit data Bytes). SDRAM transfers data in blocks of 64bits at a time (64 bits = eight 8 bit data Bytes). So when they jump up anddown about the effective speed of 800MHz RDRAM that only means a peak datatransfer rate of 1600 MB/s, that is 800 MHz times 2 Bytes at a time.The term PC2100 comes from the peak data rate of 2100 MB/s, or 266 MHz times8 Bytes  = 2128MB/s A CAS latency of 2.5 is the usual for both PC2100and PC1600 SDRAM  PC100 and PC133 both use the same old 168 pin SDRAMsocket. PC2100 and PC1600 SDRAM have 184 pins. RDRAM uses RIMM sockets. Have fun!F A Q  How to tell the real PC100 Enchilada| BAIT AND SWITCH|  | SHAREWARE BENCHMARKS |  | TIMING CHART |   | SOURCE RESISTORS |Computer Memory Market is Undergoing a TransitionPhase. I am not suprised at all to have just heardthat Hitachi and Lucky Gold Star have been sanctioned for dumping. Rambus®dRDRAM® RIMM's® are supposed to be shipping in sample quantities.I should see them here in the next few weeks or next month. Some PC-66 memory has been hard to find. Mosel Vitalic is now reputed to be shipping the fastest PC100 memory available, significantly faster than even Samsung or NEC. The future of PC100-222 Cas 2 memory is in doubt with the release of PC100 dimms with PLL and Register. Cas 3 modules seem to be fast enough for most folks. The new registered dimms are not compatible with other PC100 dimms. Micro$oft now recommends a mini