On Fri, Jan 28, 2005 at 01:46:22AM -0800, Declan Moriarty wrote: > P1-233Mhz (I presume a 66 Mhz bus) 142 MB/S Intel 430 chipset > K6/2-350Mhz 100 Mhz bus(pc100 ram) 127 MB/S SiS chipset > k6/3-500Mhz 100 Mhz bus (pc100 ram) 130 MB/s Via Chipset > P3 Coppermine -730Mhz 100 Mhz bus? 242 MB/S Intel 810 chipset > (It's loaded with pc100 ram) > AthlonXP-2.6Ghz 333 Mhz bus (?ddr RAM) 730 MB/S Via Chipset > > Unless the Intel chipsets are feeding the ram twice as fast, I fail to > see how these make sense. Particularly, how come Intel seems to get 242 > MB/S when Via and SiS only get 130 MB/s? How come the humble p233 > outsprints a k6-500? Which is real? > > I am vague about the Intel stuff because the p3 was _given_ to me, and > the p233 is an ex-ebay Industrial cpu card. > > I gather there is some difference in the way clock speeds are measured > between AMD and intel cpus. The Athlon was reported as 2.075 Mhz, > whereas in fact it's a 2.6Ghz. I have seen BIOS detect it as both. > (There was a BIOS revision on the Chaintech MB I have the Athlon in to > correct the detected cpu speed). > > Any ideas?
How many RAM-slots are attached? Probably the P3 is using two RAM banks in parallel but all other just access only to one bank at a time. (or is DDRRAM attached? double datarate: it reads at both edges of the clock). The Athlon2.6G is also using ddr ram with a 3 times higher clock, your list absolutely makes sense: all older 100MHz RAMs have 130-140MB/s (single data rate) the P3 has 2*120MB/s (double data rate) the Athlohn has 2*3*120MB/s (double data rate, 3 times higher clock) It is nice to see, that CPU speed has nothing to do with RAM speed. (at least at higher clocks). However DRAM is getting complicated these days. I am not at the state of art level in this topic. But I would expect 1-2 GBytes/s RAM transferrate at high end PC's today. M. -- Author: Matthias Weingart INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
