Author: Robert Hyatt
Date: 19:21:58 09/24/01
Go up one level in this thread
On September 24, 2001 at 21:46:56, Vincent Diepeveen wrote: >On September 24, 2001 at 00:46:35, Slater Wold wrote: > >>*Perhaps* when I sell my 2x1.7Ghz Intel, I will invest in an Alpha. That should >>be interesting! > >dual alpha 833Mhz 21264, standard edition: $20000.00 > >$20k and don't expect you can ever upgrade it to a faster Mhz those >cpu's, whereas you sure can update your intels and amds to some extend. > >It's impossible to clock those alpha's higher than 1Ghz. > >Alpha died btw. It's called intel now. IA64 is going to be the future >for 64 bits land. Poor 64 bitters... > >>One question: Obviously a node on an Alpha is not equal to a node on a x86 >>system. Mind sharing why? Or giving me some references to read up on. I've >>only been around a few Alpha machines, and that was pretty recently. And they >>were all running Windows! > >Tim Mann noted, perhaps he can explain that here again as i might have >misunderstood, that the alpha duals are not factor 2.0 HARDWARE speedup >like intel, AMD is. those 64 bits cpus suffer somehow from being put in dual. > >Don't ask me why. > >I'm no expert on buses, but i heart >the P4 has a wider bus than the P3. It didn't speed DIEP up a bit AFAIK. >A single read from RDRAM is 128 bytes wide. that's 1024 bits btw. Please don't make up numbers. There is no 1024 bit wide bus on the P4. Just look at the MB. That bus would take 1/2 the surface area. > >That 256 bits wide bus from alpha, that's just 32 bytes? That is correct... and it is 4x wider than the intel bus at present or past. > >Note DDR ram is 64 bytes at once AFAIK. That's 512 bits. latency 1.5 times >faster than that from RDRAM though. > Note that it isn't. There is no way to clock that in to the processor. Just take it out, and count the pins or edge connectors (depending on which you have). When you find 512, plus another 200 for the normal address and control signals, you can talk about a 512 bit wide bus. No intel chip has such a thing...
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