single channel vs dual channel

[saaya]

some peops were curious if its worth to go dual channel with amd so i ran a few benches.

1700+@2.3ghz (11.5x200)
8rda+ v1.1 bios 3305
twinmos 3700 and hyper x 3500 cl2-3-3-7 (twinmos wont take better timings :/)
ibm deskstar 40gb
albatron 4200 128mb 250/250

dc

memo 3012/2837
cpu 8532/3431
mm 12337/13335
2k1 12620
2k3 1484
2k2 7062/5568/912

sc

memo 2935/2723
cpu 8525/3467
mm 12352/13377
2k1 12435
2k3 1466
2k2 7065/5425/913

so dual chanel gives:
185+ in 2k1
18+ in 2k1
143+ in 2k2 memory

thats +1.5% in 2k1 +1.3% in 2k3 and +2.5% in 2k2`s memory score.

draw your won conclusions from that, but its not really worth it considering you cant pump the fsb as high in dc as in sc.

im going to run them in sc now trying to reach 250.

[Iolao]

I disagree. Every nforce2 out there has a wall at 240/245 for chipset limitations. Going 240 DC is very possible even with tight timings (BH5 winbond chips for example). With AMD systems bandwith efficiency is imperative.

[saaya]

well so far i only heard that everybody can up their fsb ~10mhz in sc when dc crapps out. thats about the same expirience ive had with my 8rda+ so far (no vdd mod yet)

so you gain more than 2% in dual channel? show me

there is not THE wall with nf2 chipsets. some oc to 270, only because yours craps out at 240/245 doesnt mean thats the limit of all nf2 boards.

[danbfree]

Thats about what I thought, saaya... What happens when you go only 4/5 on the memory (memory 200, FSB 250)? Does that take a huge performance hit and if so does DC help over SC?? hmmm... And can you REALLY crank the FSB up when you do that? Then again, you probably are wasting much of the benefit of high FSB that way AND running asynch...

[Pita^Norf]

Originally posted by saaya
some peops were curious if its worth to go dual channel with amd so i ran a few benches.

1700+@2.3ghz (11.5x200)
8rda+ v1.1 bios 3305
twinmos 3700 and hyper x 3500 cl2-3-3-7 (twinmos wont take better timings :/)
ibm deskstar 40gb
albatron 4200 128mb 250/250

dc

memo 3012/2837
cpu 8532/3431
mm 12337/13335
2k1 12620
2k3 1484
2k2 7062/5568/912

sc

memo 2935/2723
cpu 8525/3467
mm 12352/13377
2k1 12435
2k3 1466
2k2 7065/5425/913

so dual chanel gives:
185+ in 2k1
18+ in 2k1
143+ in 2k2 memory

thats +1.5% in 2k1 +1.3% in 2k3 and +2.5% in 2k2`s memory score.

draw your won conclusions from that, but its not really worth it considering you cant pump the fsb as high in dc as in sc.

im going to run them in sc now trying to reach 250.

Interesting results.

Am I correct in assumeing that these results were derived from testing a pair of Twimos' and a pair Hyper X and ran them in Dual and Single channel configuration i.e 2x 256 in DC slots and then 2 x 256 in SC slots ?

[q149]

I also tested this with Sandra bandwidth test.. i saw over twice as much increase as you but that's the only test i ran.

[Iolao]

Originally posted by saaya
well so far i only heard that everybody can up their fsb ~10mhz in sc when dc crapps out. thats about the same expirience ive had with my 8rda+ so far (no vdd mod yet)

so you gain more than 2% in dual channel? show me

there is not THE wall with nf2 chipsets. some oc to 270, only because yours craps out at 240/245 doesnt mean thats the limit of all nf2 boards.

Sorry I was wrong, I meant all Abit nforce2 crap out at max 240 with cpu interface enabled dual channel... I will explain better my opinion: if you know current ram can get you at max 250mhz tight timings with heavy overvolting, you have to aim at that goal with the most efficient bandwith you can, in this case dual channel is the way to go. I'm now 240 DC rock solid aggressive timings but I know my ram can go higher and I feel this is a chipset limitation as NOONE has gone over 240 rock solid or 242 3D benchable, regardless of the type of ram used. Going single channel can give you some mhz over dc (let's say 10 mhz) but the chipset remains the limit; moreover you should use 1x512MB instead of 2x256MB for example and the greater the stick usually the less the overclock...

[saaya]

@danbfree, i cant go 250fsb at the moment, still havent done the vdd mod, ill post benches once have.

@Pita^Norf, not sure what you mean. however i benched with 1stick of twinmos 3700 and 1 stick of hyperx 3500. in sc they were placed in slot1 and slot2 in dc they were played in slot1 and slot3.

@iolao, could you try sc and dc @240 with the same timings? maybe dc improves the scores more when you are running a higher fsb/memory clock. so you hit a wall at 240mhz? you cant get a single mhz higher fsb in single channel? most people so far told me that highest fsb in sc was higher than max fsb in dc.

but they choose dc, dc has a lower fsb memory speed BUT since the memory speed is lower they can set their memory to better timings and thats why they score higher.

but i think with the same timings you dont see a lot of improvement with dc over sc.