Author: Vincent Diepeveen
Date: 10:49:29 09/27/00
Hello,
despite its high price and the fact that many people
trash RDRAM for being not much faster, its latency is
way less as SDRAM. Some cool articles recently written
give the next numbers:
Latency for ns T latency
PC133 SDRAM-222 7.5 10 75 clocks
PC133 normal 7.5 11 83 clocks
PC800 1.25 15 19 clocks
PC700 1.4 15 21 clocks
PC600 1.88 15 29 clocks
So PC800 just because it runs at that a high Mhz (800) is
nearly 4 times faster as the fastest SDRAM, and over 4 times
for normal 133Mhz SDRAM. Now most buses even work at 100Mhz,
which is even slower, which gets it to nearly 5 times faster.
Chessprograms only need now and then a cache line from a random
memory spot, either for hashtables, or for other things, so
definitely RDRAM will speedup chessprogram a lot.
Also the much praised and cheap to produce
DDR RAM which so far i couldn't find in
any shop, it's just 2 times faster as SDRAM, so when you
are just busy running a chessprogram, then the expensive RDRAM
sure has its advantages, or anything that needs a lot of small random
lookups, then RDRAM is the memory to go for (if you can affort it).
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