Here is how you figure it out
http://www.wdc.com/en/library/sata/2879-701260.pdfThe Latency + Read = 9.2ms which is actually SLOWER than the SATA150 Raptor which specs out at 7.6-8ms
Not a wild amount slower, but there is a lag in latency none the less
the next number you want to look at is the RPM.. both the same however because of the platter size geometry rules state the larger platter at 10K will produce the faster result...
OK, so now we have a - and a + which balance things out
last, what is the buffer to disk speed of each...
The SATA150 Raptor is 85MB/s
The SATA300 VelociRaptor is 120 MB/s (Sustained)
therefore we have a new King and it is the VelociRaptor
There are drives that are better suited for enterprise use but for home desktop, you are looking at a 20-30% better than the RaptorX