Difference between DC DDR boards

[1ctabor]

What difference is there with the dc ddr boards between intel and amd? Does the amd boards provide the athlon 4.2gb of memory bandwidth like the intel board does? If so does it benefit the athlon? Also which pc(2100, 2700, 3200) memory works with the dc ddr for the intel and amd chips?

[speed freak]

The DC gives the amount that the rated stick would, times 2 (DC)

The Athlon doesn't benifit from it as much as the Intel does, and the nForce supports DDR400, while the Intel chipset E7205 only supports DDR266 officially.

[1ctabor]

Originally posted by speed freak
The DC gives the amount that the rated stick would, times 2 (DC)

The Athlon doesn't benifit from it as much as the Intel does, and the nForce supports DDR400, while the Intel chipset E7205 only supports DDR266 officially.

Is ddr400 different from pc3200 or 2700,2100?

[Almost Famous]

Originally posted by 1ctabor
Is ddr400 different from pc3200 or 2700,2100?

DDR400 is PC3200

[marv]

Originally posted by 1ctabor
Is ddr400 different from pc3200 or 2700,2100?

DDR400=PC3200=3.2GB/s of maximum bandwidth to the processor
DDR333=PC2700=2.7GB/s "
DDR266=PC2100=2.1GB/s "
DDR200=PC1800=1.8GB/s "

Going Dual Channel, just double the above.

Rambus PC1066 in comparision runs about 3.2GB/s, or about 2.7 for PC800.

SDRAM, for comparision, PC-100 about 1.1GB/s

JEDEC just recently approved the DDR400 standard.

What's available for bandwidth and whats used are two differant animals, the P4 can use and needs more bandwidth than the XP.

EDIT: you have a couple of nice looking rig's there *cough* Almost Famous...

[Almost Famous]

Originally posted by marv


DDR400=PC3200=3.2GB/s of maximum bandwidth to the processor
DDR333=PC2700=2.7GB/s "
DDR266=PC2100=2.1GB/s "
DDR200=PC1800=1.8GB/s "

Going Dual Channel, just double the above.

Rambus PC1066 in comparision runs about 3.2GB/s, or about 2.7 for PC800.

SDRAM, for comparision, PC-100 about 1.1GB/s

JEDEC just recently approved the DDR400 standard.

What's available for bandwidth and whats used are two differant animals, the P4 can use and needs more bandwidth than the XP.

EDIT: you have a couple of nice looking rig's there *cough* Almost Famous...

Oh why thank you Marv...*cough*cough*....like the mem bandwidth on the XP rig? lol

[marv]

Originally posted by Almost Famous


Oh why thank you Marv...*cough*cough*....like the mem bandwidth on the XP rig? lol

The bandwidth looks great, I could be interested in that setup. Very nice article you wrote BTW.

[1ctabor]

So can you have a dual channel pc3200 setup with both intel and amd giving 6.4GB? Wouldn't this deliver more bandwidth than PC 1066 at 4.2?

[speed freak]

Originally posted by 1ctabor
So can you have a dual channel pc3200 setup with both intel and amd giving 6.4GB? Wouldn't this deliver more bandwidth than PC 1066 at 4.2?

Thanks marv, I said that in lameman, but I geuss I shoulda elaborated

also, you can not have DC DDR400 on any INTEL platform at the moment, as the max official supported type is PC2100 (DDR266) IF possible, you can OC the heck outta your P4, and get it to 200 FSB (quad pumped, being 800) but good luck. Secondly, I believe that the E7205 limits your CPU/mem ratio choices (I actually don't think there is a divider, please correct me if I am wrong) so, in other words, almost no chance of DC DDR400 for Intel yet.

*EDIT*

you can use DDR400 (PC3200) but you will not be using the full potential.

[Almost Famous]

Originally posted by marv


The bandwidth looks great, I could be interested in that setup. Very nice article you wrote BTW.

Thanks...too bad the real overclock came after I finished the article...but I was "under the gun" to get it out

[Kowan]

PC1066x4=4.2GB PC800x4=3.2GB bandwidth
PC4200 32-bit, (because people thought the DDR ratings were faster memory) i.e. PC3200/PC3500 vs. old slow PC1066.

The GB boards use a synchronous memory and front side bus because DDR266 supplies the 4.2GB needed running DC.

[1ctabor]

Ok so then whats the highest bandwidth you can get for both intel and amd? Intel = 4.2gb from dual channel pc2100 or 1066 rdram........AMD = ? from dual channel pc3200 would it be 6.4 , if so then is there more memory bandwidth available to AMD than intel at the moment?

[Almost Famous]

Originally posted by 1ctabor
Ok so then whats the highest bandwidth you can get for both intel and amd? Intel = 4.2gb from dual channel pc2100 or 1066 rdram........AMD = ? from dual channel pc3200 would it be 6.4 , if so then is there more memory bandwidth available to AMD than intel at the moment?

Here's my mem bench from my 2400+@2217Mhz running 422DCDDR on my A7N8X running synch:


And here's my mem bench from my [email protected] 424DDR running on my P4B533 running asynch:



The AXP rig is DCDDR where as the P4 rig is only DDR, both running almost the same mem frequency. I believe that DCDDR on the P4 rig is gonna blow away memory benches as compared to the NForce2 DCDDR, but you never know what will happen when VIA releases their socket A DCDDR chipsets.