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#21
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Ghazan Haider wrote:
As for the P4 vs P3, I really dont know. Theres the P4 Xeon, and then theres the good but hot Athlon. Huh? Man you're way behind the times. The latest P4s run a lot hotter than the latest Athlons. -- ~misfit~ |
#22
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Ghazan Haider wrote:
I had also been browsing some Ultra160 SCSI cards and their disks, along with their response times, cache, throughput etc. Turns out they equivalent to the cheaper and much larger SATA150 disks. I looked into some 15K rpm Ultra320 disks but could never justify the cost. If you plan to go Ultra160, might as well head for SATA and some 7200 disk with 8mb cache and low response time. Under heavy database write load the SCSI does have advantages, SCSI drives accept the data and return status later when the physical write has been done. ATAPI drives can (a) accept and cache the data then tell you the write is complete (it's not, bad for database work) or (b) have the write cache disabled, in which case the performnance will really rot. There are other cases, but db is the one where you depend on the writes really being done (via fsync or similar). Above 400fsb I think the bottleneck is the disk and CPU, and other PCI cards in the system. I wouldnt recommend going all the way to 800fsb while getting weaker CPU performance. It depends a lot on what you do, compute intensive applications can use a LOT of memory bandwidth. Not just engineering calculations, but graphics, games, etc. Add high video update rates to that and memory bandwidth does make a difference. -- bill davidsen CTO, TMR Associates Inc |
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