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Adding Memory to DDR266

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May 10, 2005 1:50:22 AM

I just upgraded my system using a mix of old a new parts -- my new system consists currently of:

AMD64 3000+
DFI LanParty UT nForce3
WD 60MB HD
GT6800
Old DDR266 512MB memory stick (2.5-3-6-3, single channel 64bit) -- crucial I think.
nothing OC'd

I was thinking about getting some memory since it was so cheap. I primarily use my machine for gaming. Question:

1) Will I get much of a performance boost by replacing w/ DDR400? Anyone have a guess of how much?
2) Am I better off adding 512MB of faster memory, and then adding another one later?
3) Or am I okay with my old slow memory?

Thanks so much for your opinions!

j-

More about : adding memory ddr266

May 10, 2005 6:28:30 PM

suggestions..
1. Assuming the same latency, DDR-266 to DDR-400 will give you about 15%-19% increase in performance. Not too shabby.
-more important is the difference in CAS latency from module to module.

2. Yes. Is this a trick question?

3. You will survive with your old memory. Depends if you are wanting to spend money on a memory upgrade or not.

Yoda said it best: Do. Or do not. There is no try.

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<font color=red>AIM BrentUnitedMem
May 10, 2005 6:33:55 PM

Thanks -- 15 to 19% is a lot!

As to question #2; What I meant was am I better off adding 512mb stick to my existing slower memory, and then perhaps later on replacing that slower memory? If I understand correctly, adding faster memory to my slower memory will slow down the faster memory, resulting in the advantage of more memory, but not faster memory. Is that correct?
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May 10, 2005 6:53:02 PM

In general 1GB DDR266 is better that 512MB DDR-400.

So, adding an additional 512MB stick seems like a good idea. And yes it will clock down to DDR266.

When you win the lotto, you can finally upgrade to DDR-400.

Don't forget to buy all of us new memory too.

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"Memory with lifetime warranty? So, whose lifetime is that?"
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<font color=red>AIM BrentUnitedMem
May 11, 2005 12:36:07 PM

PC3200 is only 33% faster than PC2100, now you have to bear in mind two things 1) a 33% increase in clock speed never gives a 33% boost in real world performance and 2) It is only the memory sub system getting the performance boost and not the entire computer.

Bearing this in mind i think a 10%(possibly 15%) performance increase is the most you will see.
May 11, 2005 5:32:48 PM

The correct boost from 2100 to 3200 has a max potential of:
3200/2100 = 1.52 = 52% increase in theoretical performace

That's also how they get 18.5% increase from 2700 to 3200:
3200/2700 = 1.185 = 18.5 increase in theoretical performance

2700 to 3200 has a real world potential of about 4-6% increase in performance.

2100 to 3200 has a real world potential of about 15%. I've heard as much as 19% increase is possible.

Also, you have to keep the following factors in mind:
1. No such thing as zero latency
2. Real world electronic circuits have natural resistance and noise.
3. These are best-case calculations.
4. The calculation comparisons are between components of the same latency.

note for #4:
Of course you may see above 20% increase from DDR266 to DDR400 assuming same latency. However, most applications go from DDR266 CL2 to DDR400 CL3 (One clock additive latency), which might give about 10-15% increase.

<font color=green>*****
"Memory with lifetime warranty? So, whose lifetime is that?"
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<font color=red>AIM BrentUnitedMem
May 14, 2005 5:58:36 PM

In addition to the increased speed of the memory, the second stick of memory MAY allow him to go dual channel. Definitely if he gets a 2X512MB of DDR400. With prices as low as they are, I would hold off on one night out on the town and put that money towards the memory...

Nobody said it, so I'll throw it out there. If he adds a stick of PC3200 into the system with the PC2100, then the system will clock both RAM at the PC2100 speeds. He'll get the benefit of the extra memory, but not the extra memory speed. That being said, modern games will really take advantage of the extra 512MB - whatever the speed.

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