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thanks for the info, Praxis. I am using PIII 600 with a 133MHZ FSB, with a ASUS motherboard P3V4X, which is a VIA apollo Pro motherboard. What is CAS 2 and CAS 3? Sorry, I am not too familiar with this. What do u mean by high density memory? Is it as good as the brand name such as crucial or PNY? Were u suggesting that I should get rid of the old generic memory and put in new crucial memory, that way it would enhance the performance? >>
From Crucial's web page:
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Latency (also called CAS Latency): The amount of time in nanoseconds (often measured in clock cycles) between a request to read the memory, and when it is actually output. SDRAMs are typically referred to as CL2 or CL3, with CL2 parts being faster. >>
The upshot seems to be that CAS 2 memory is perhaps 5-10% faster than CAS 3, about the same advantage that you can get by manipulating certain settings in the BIOS, like pushing bank timing from 10 ns to Turbo and using 4 bank DIMM interleave. Change one thing at a time; back off if system instability results. Sometimes this can seem very capricious. I have a stick of Mushkin Budget PC133 that was supposed to be CAS 3 but did CAS 2 stably in 3-4 different systems, but wouldn't even boot Windows at CAS 2 if there was another stick of CAS 2 stuff in the machine. So I'm running it as CAS 3 now, figuring that 384 MB of CAS 3 is better than 256 MB of CAS 2.
I may be wrong about this, since even
Crucial doesn't report particularly significant performance gains above 192 MB (in fact a couple of benchmarks were even a tiny bit SLOWER with 256 than with 192 MB). Winstone benchmark increases from 128 MB to 256 were typically only a couple of percent or so with Win98,W2K and NT4. Surprisingly you got FAR more performance increase (at least with this benchmark) by migrating from Win98SE to W2K (an average of 29%). But I run Linux on the box, which can be a bit of a memory hog if (like me) you don't know exactly which services you should disable.
As to the density question, high density SDRAM is very cheap, but not noted as high quality stuff. It will probably only run at CAS 3, though some folks report running it at CAS 2 pushed (I never tried to run mine at CAS 2). Only some chipsets can handle high density DIMMs, particular the VIA KT133, KT133A, KL133, KM133, KX133 and your Via Apollo Pro chipset. (In fact, your particular board passed muster with
Syncmax's popular high density RAM.) I don't know how well high density and low density DIMMs co-exist in the same motherboard, but I haven't heard that there is any problem.
It seems to me that you have two reasonable upgrade paths.
1) Find another use for your old stick if it can't handle CAS 2 at PC133 (did you download CTSPD or try running your stick at 133 FSB CAS 2?) and buy 128-256 MB of this CAS 2 PC133 stuff.
2) Buy a stick of cheap high density PC133 and run it in tandem with your current RAM.
Choice Number 1 would cost $30-35 more (for 256 MB), but would probably be faster than Choice 2 in Windows for most things. But be warned, I'm not an expert; it?s all just Juju & Black Magic to me.