FSB vs CAS what's better?

[Big_KiD]

I just got off the phone with a mushkin rep. He said that better cas specs is more important than a higher FSB. I was wondering what others opinions are about this subject, specifically I am looking at Mushkin pc2100 HiPerformance and Pc 2400.. The 21 hi po is dramatically more expensive when compared to the 2400. The rep said it's because the 2100 would give me cas 222 at 266 fsb while the 2400 would give me cas 232 at 300fsb.. ahh i wish i could have both and compare.. Can someone please share some insight with me!!!!

[Jon]

My memory (primarily Crucial over 3 systems that have it) gets better memory bandwidth at 150MHz FSB CAS3 than does 133MHz FSB CAS2.

The Mushkin, more than likely, will run CAS2 at 150MHz anyway. It is a very popular overclocking memory brand. There is no guarantee it will do this but it is highly likely.

All of my Crucial 256MB modules do 150MHZ CAS2 easily for other considerations.

[CrackedSKull]

Originally posted by Jon

All of my Crucial 256MB modules do 150MHZ CAS2 easily for other considerations.

I second that.

[Big_KiD]

cas 2-2-2..... or cas 2-3-2... that's what i want to know.

[Amedeo602]

Originally posted by Big_KiD
cas 2-2-2..... or cas 2-3-2... that's what i want to know.

2-2-2 is faster for the ram, while 2-3-2 runs at a higher fsb...try both and see which gives you better numbers

[Big_KiD]

i realize that 2-2-2 is faster transfer for the ram and that 2-3-2 is faster frontside bus.. ddr 2400.. my orginal post was "which will walk the dog the fastest". let me refraze that .. I don't have both types of ram and i can't afford both so i can't test with both. does anyone have any hard #'s comparing the two!!!!!

[Monaco]

Right now, I am choosing CAS 2-2-2 over a higher FSB. My RAM tops out at 2-2-2 150mhz, but the chip goes to a higher FSB than that if I set it to 3-3-3.

It's only the difference between 112 and 115 FSB, really, not too much, but i do get an extra 150 or so 3dmarks set to 2-2-2 vs 50 or so from the higher FSB. So I leave it like it is.

[6502kid]

Get the good ram now.

Then if you decide to crank up your FSB later, you shouldn't
have any problems....

[Gravity Man]

I've had much better results tweaking the latency than raising the FSB. It took me 5 hours of testing and tweaking to find the best combo of timings/clock speed

[Oni]

Originally posted by Gravity Man
I've had much better results tweaking the latency than raising the FSB. It took me 5 hours of testing and tweaking to find the best combo of timings/clock speed

And what were your findings? Please, share! ^_^

[The Overclocker]

on the main page there is a review of a chipset waterblock, in that a 170MHz bus was worse the a cas 2 150MHz bus

[WyrmMaster]

I get better memory scores at 145 cas2 than i do a 166 cas3.

[Gravity Man]

Originally posted by Oni


And what were your findings? Please, share! ^_^
With my 256 MB of crucial PC-2100 and DFI AK-76SN motherboard, I reached the limits of performance at 142 FSB, anything past that, and I would have to back off my timings to a point where my performance would be worse than with a slower clock rate. The settings I found to be the best were as follows:
FSB..........................142
PH Limit....................8
Idle Limit..................8
Trc Timing Value.......6
Trp Timing Value......2
Tras Timing Value....2
CAS Latency............2
Trc Timing Value......2
Your results may vary based on your own configuration. I set my multiplier low to test the memory performance, and, due to processor constraints, I am currently using these timings with my FSB set to 139.