View Full Version : 256MB RDRAM vs 256MB DDR SDRAM

03-03-2003, 01:37 PM
I am comparing the specs of two PCs.

One has a Pentium 4, 2.8GHz & 256MB RDRAM.

The other a Pentium 4, 2.66GHz & 256MB DDR SDRAM.

What would be the difference between the two? Most of the other specs appear to be the same.

I am looking for a Computer for Video editing.

Any help please. P.

03-03-2003, 01:41 PM
RDRam is much more expensive than DDR. Performance wise I would have thought RDRam was better, but DDR is much cheaper and more readily available.


03-03-2003, 03:33 PM
Yeah, Im under the impression RD-RAM is (marginally) faster, but is only for Pentium 4 mobo's, so if you ever upgrade and decide you want an AMD CPU, then you've gotta buy new RAM.

DDR is cheaper, and for the minimal improvements, probably better, unless you're gonna have your PC for MANY years to come :-)

03-03-2003, 05:41 PM
>What would be the difference between the two?


the 2.8ghz with RDRAM will be faster than the 2,66 with DDR but it will be a more expencive. it all depends on your budget.

03-03-2003, 07:27 PM
There is more latency with RDRAM but there is more bandwidth as well.

Murray P
03-03-2003, 07:54 PM
At Price Spy:

512MB PC2700 DDR = $122.63

512MB PC 3500/3300 DDR = $175.06

256MB PC800 RDRAM = $214.75

512MB PC800 RDRAM = $517.50

A few issues back PC World had some benchmarks on the relative merits of AMD XP vs P4 with some info on what apps ran better with what cpu and ram pairing, etc.


Murray P

04-03-2003, 04:23 PM
I would suggest you go to QMB.co.nz QUICK!

DDR-RAM was abuot $55 for 256MB, as opposed to SD-RAM (256MB) being $59!!!!!!

05-03-2003, 07:53 AM
Thanks for the comments folks.

It was more to do with the tech comparison that I was interested in. Why would a company sell one PC with RDRAM and one with SDRAM? Is one better than the other, and why?

I have no idea what 'latency' is. Will have to try a 'search'. Thanks.


05-03-2003, 10:18 AM
> Why would a company sell one PC with RDRAM and one with SDRAM? Is one better than the other, and why?

i think thats already answered. the RDRAM sytem with the faster cpu is faster but more expencive. only those who want the fastest pc and have plenty of $$$ would buy it. those with a tighter budget would go for the DDR system. its slower but it has a better speed/$$$ ratio.

the high fsb of the later p4's is big enough to make use of the high bandwidth RDRAM has. however withh DDR400 and dual DDR chipsets coming out dualDDR might be better .

Graham L
05-03-2003, 04:20 PM
My cynical response to "fast" computers is: "Look how fast my computer is waiting for me to hit the next key". :D

05-03-2003, 05:02 PM
I think the biggest bottleneck of PC's at the moment is the HDD!

05-03-2003, 08:08 PM
That maybe so Graham but in that time the CPU is crunching Distributed.net (http://www.distributed.net), or UD (http://www.uniteddevices.com) or similar.