Dual Channel DDR vs DDR

[Schneman]

What do you gain with using 2 x 512 Dual Channel DDR 2100 vs 1 x 512 DDR333 or 400 for overclocking purposes.

Guess it depends upon which board they will be used in?

Thanks for any comments

Dale:eh?: :eh?:

[pko/c]

If you use dual DDR you are going to have an increase in your system performance and even more if you overclock it.The motherboard also plays an important role.

[R4z0r4mu5 Pr|m3]

you gain 512mb of ram, you can increase the fsb by a lot if you have higher rated ram and an unlocked processor where you can lower the multiplier, dual channel ddr doesn't do much, increases performance by a mere 3%, it was a big hype for nothing

[dreammmatt]

well, here's the thing, Dual channel increases the bandwidth a whole bunch, about doubles it...and the benchmarks that many people look at, arent too intensive on memory bandwidth...and from the explainations that i've heard...if u are gonna go async, with all that extra bandwidth, it wont make too big of a difference to go async - - heh, know what? i am about to try it, right now i am doing 170sync'd on a 1600+ and PC2100, i will try 200/166, and post with my results...i hear that the latency may make me hate it, but...we shall see...

[Supertrucker]

but the question he asked would be whats the difference between dual 2100 and 1 ddr333 or 400. dual 2100 would provide 4.2gb/s bandwidth so you could run the memeory in spec at 133 and run the processer well over 200fsb on an amd and still not use all the memory bandwidth although i dont know for sure if a board would support running the ram slower than the processer. but if you run in sync then it is a waste because if you run 2xpc2700 you get roughly 5.4gb/s and your amd at 333fsb can only use 2.7gbs of bandwidth. its like having a corvette with a wooden block behind the gas pedal, doesnt matter if the engine can do 150+ if you can only push it to 65

[Stumpjumper5200]

3% gain? Well yeah, for an AMD. Dual DDR is an absolute godsend for P4's. Cheap memory that can easily beat top-end PC3200.

A DualDDR + Pentium4 that reaches very high fsb = More bandwidth that you can imagine :D

[drewthomas14]

why cant amd use all the bandwidth?

[Stumpjumper5200]

Because..........they just can't :D

They only have a DDR fsb. So if the fsb is 133, it's effectively 266.

Intel's have a Quad-pumped bus, so if you're at 133fsb, it's effectively 533mhz.

And your fsb can only use what memory bandwidth it has the power to transfer.

[skahtul]

Originally posted by Stumpjumper5200
Because..........they just can't :D

They only have a DDR fsb. So if the fsb is 133, it's effectively 266.

Intel's have a Quad-pumped bus, so if you're at 133fsb, it's effectively 533mhz.

And your fsb can only use what memory bandwidth it has the power to transfer.

Well actually the AMD goes to 333 FSB such as in the NVIDIA nForce2. But the Intel's are still up there.

[Schneman]

Back to my original question - I should of specified that I will be running a Intel P4 and not the AMD.

Will likely get the P4PE or the P4G8X and was just wondering which would give me faster performance and what memory setup would be needed to achieve this.

Hear a lot that Dual Channel 2700 would be better than 1x512 of 3200. Is that so?

Someone said that anything over 512 RAM is wasted. The boards can only really utilize 512?? If so why are some putting Gig of RAM in their machines?

Oh yea, most likely running a 2.53 or 2.66 with these boards.

If I catch the drift from (tons of THREADS) if you don't plan on pushing the P4G8X it's not worth the extra money?

Thanks for the continued feedback.
:rolleyes:

[Stumpjumper5200]

I would say get the P4G8X and two sticks of 256MB Corsair XMS PC3200. PC2700 would do just fine, but it might hold you back if you manage to get past 166fsb. So I would recommend PC3200 in case you get a high-fsb capable chip.

The main key to performance in a Granite Bay board is having a good overclocker like a 2.4B to reach high fsb speeds and REALLY get that memory bandwidth cranked up :D

For example, my chip isn't exactly good for high fsb speeds, but right now I've got it at 150fsb and Sandra's telling me I have a little over 3600Megs/second memory bandwidth.

I tried a 2.4B in this system that didn't feel like breaking 3Ghz on low voltage, but I had that at around 160fsb and it was giving me about 3800-3900Megs/second memory bandwidth :D :cool:

Get a chip that'll get you over 170fsb and you'll be flying!

[ninthebin]

Well actually the AMD goes to 333 FSB such as in the NVIDIA nForce2. But the Intel's are still up there.

its not the board that defines the bus of the processor, the latest ones have started coming with the 333MHz Host clock, that KT333+, NForce2 chipsets will be nicely taking advantage of, but you put a Athlon with 266FSB in an Nforce2 board its not gonna widen itself cos the board is using that certain chipset

AMD cant use this bandwidth because of this 266/333 host bus...

they effectivly give you 2.1GBs and 2.6GBs respectivly, whilst intels 533MHz bus gives 4.2GBs, so as you can see quite a big gap

bear in mind that DCDDR400 would give 6.4GBs this is still then a gap from Intels host bus's bandwidth

[Schneman]

Stumpjumper - are you saying the 2.4b is a better OC chip than the 2.53 or 2.66?

[Stumpjumper5200]

Originally posted by Schneman
Stumpjumper - are you saying the 2.4b is a better OC chip than the 2.53 or 2.66?

Well, not necessarily.....

I'm sure there's 2.66's and 2.53's that can get more MHz than some 2.4b's....you never know, really. But, the 2.4B has a lower multiplier than the higher MHz chips, so that gives you the chance of getting higher fsb speeds, even if it doesn't get as big an overclock than the faster chips.

It's not just the MHz of the CPU, it's the whole system. So a 2.4B overclocked to 2.8 would most likely beat a stock 2.8 (especially on a Granite Bay board where the memory scales up with the fsb, and gives very big gains on high fsb's) because of its higher fsb and more bandwidth. Of course it does depend on what kind of benchmarks are being applied.

[skahtul]

Originally posted by ninthebin


its not the board that defines the bus of the processor, the latest ones have started coming with the 333MHz Host clock, that KT333+, NForce2 chipsets will be nicely taking advantage of, but you put a Athlon with 266FSB in an Nforce2 board its not gonna widen itself cos the board is using that certain chipset



I gave a short crummy answer, and also it takes both to support it. If you put a CPU that supports 333MHz in my old Gigabyte that supports 266, then the CPU will not run at 333.