Anyone tried Dual Channel DDR with a DC?

[titanmiller]

Originally posted by: ReelC00L
mech or anyone else: is there a link to read more about Dual Channel DDR? If I understood correctly, the DDR trick was to use both the rising + falling of the clock cycles to effectively double the throughput. If so, how does Dual Channel change things?

The FSB on most motherboards is 64 bits wide (64 lane highway), The nForce2 takes Hwy 1 (bank 1), plus Hwy 2 (bank 2), and puts them together to make the equivilance of a 128 bit (128 lane highway) bus. That is the basis of it. DDR400 produces 3.2gb/second bandwidth on a 64 bit bus but enabiling DualChannel results in 6.4gb/second on a 128bit bus. And if they were to create a Quad Channel DDR controler that would result in 12.8gb/second (not gonna' happen any time soon!) on a 256bit bus.

 

[adeno]

I wish I could get some pc3200. Those Twin Bank Corsair modules look really nice

I was lucky enough to get a week 45 JIUHB xp1700+ Thoroughbred B from newegg, which currently runs at 2.41 GHz with my EPoX 8RDA+. I am running 2 Crucial pc2100 modules at 192 MHz so I cannot get the fast memory timings. Running SETI on this, I was able to average 2 hrs 10 mins, but unable to hit sub-2 hr times (I didn't get those VHAR WUs )

I need to get a pair of pc3200 to see the real stats

 

[mechBgon]

Dude! Now THAT is what I call getting your moneys' worth!

 

[adeno]

The thing is, I think the chip can surpass even 2.4 GHz.. maybe even 2.5 GHz+ :Q
If only I had some watercooling.. then I could find out

I'm eager to find out about using a pair of pc3200 for Dual Channel DDR with this rig, but unfortunately I'm broke for now.

 

[mechBgon]

THUGSROOK did some benchmarking that could save you a little money: XMS3000 baby!

 

[adeno]

Thanks for that link!

That's some quality DDR :Q XMS3000 is on my next-upgrade-to-buy list now.. lol

 

[zeruty]

Originally posted by: mechBgon
BigJ2078, is your CPU a Thoroughbred? If so, you should also have the option to drop your multiplier to 11.5 in the BIOS, then boost the RAM and FSB synchronously to at least 185MHz to fatten up your memory pipe even more! If it's a Palomino, you can always manually unlock the bridges if you want.

edit: if you do this, manually specify your AGP bus at 66MHz and this will also lock in your PCI bus at 33MHz as it should be.

A bit of advice from my experience with the A7N8X Deluxe
if you get the board with the G version of the BIOS, and you try to change the multiplier (with a t-bred B), on post the system will fail and say "WARNING!! CPU has overspeed" or something like that.
and the voice post reporter will say "system failed due to CPU overclocking"

if you downgrade to the C or the E BIOS, you should then be able to change the multiplier
I am hoping the new ones after G will allow the multiplier change, but who knows....

 

[mechBgon]

Originally posted by: zeruty

Originally posted by: mechBgon
BigJ2078, is your CPU a Thoroughbred? If so, you should also have the option to drop your multiplier to 11.5 in the BIOS, then boost the RAM and FSB synchronously to at least 185MHz to fatten up your memory pipe even more! If it's a Palomino, you can always manually unlock the bridges if you want.

edit: if you do this, manually specify your AGP bus at 66MHz and this will also lock in your PCI bus at 33MHz as it should be.

A bit of advice from my experience with the A7N8X Deluxe
if you get the board with the G version of the BIOS, and you try to change the multiplier (with a t-bred B), on post the system will fail and say "WARNING!! CPU has overspeed" or something like that.
and the voice post reporter will say "system failed due to CPU overclocking"

if you downgrade to the C or the E BIOS, you should then be able to change the multiplier
I am hoping the new ones after G will allow the multiplier change, but who knows....

Here's exactly what you need: The Secret BIOS It fixes many of the wacky glitches in The BIOS Of Doom (1001G), according to CoolLight and chizow.

 

[Evadman]

Well, after extensive testing, I have found m my case that using Dual Channel DDR on an nForce board at 100 Mhz Frequency is nearly useless. My times were almost identical; 5 hours or 5 hours.

Board: MS-6353 nForce420.
Memory: Crucial 2100 DDR running at Cas3
CPU: 1700+ Running at 100 FSB (board bios does not correctly identify the chip.*shrugs*)
Dataset: 18 WU's for single channel and 26 for Dual channel. CSV availabe here If you want to see for yourself, or double check my work.

 

[Assimilator1]

Originally posted by: adelacru
I wish I could get some pc3200. Those Twin Bank Corsair modules look really nice

I was lucky enough to get a week 45 JIUHB xp1700+ Thoroughbred B from newegg, which currently runs at 2.41 GHz with my EPoX 8RDA+. I am running 2 Crucial pc2100 modules at 192 MHz so I cannot get the fast memory timings. Running SETI on this, I was able to average 2 hrs 10 mins, but unable to hit sub-2 hr times (I didn't get those VHAR WUs )

I need to get a pair of pc3200 to see the real stats

That's an awesome overclock!:Q
Tempts me to get one myself

Whats the typical overclock of an XP1700 Tbred B?

 

[Actaeon]

Originally posted by: Assimilator1

Originally posted by: adelacru
I wish I could get some pc3200. Those Twin Bank Corsair modules look really nice

I was lucky enough to get a week 45 JIUHB xp1700+ Thoroughbred B from newegg, which currently runs at 2.41 GHz with my EPoX 8RDA+. I am running 2 Crucial pc2100 modules at 192 MHz so I cannot get the fast memory timings. Running SETI on this, I was able to average 2 hrs 10 mins, but unable to hit sub-2 hr times (I didn't get those VHAR WUs )

I need to get a pair of pc3200 to see the real stats

That's an awesome overclock!:Q
Tempts me to get one myself

Whats the typical overclock of an XP1700 Tbred B?

Mostly 2100+'s but has a few 1700+s

 

[m0ti]

Originally posted by: adelacru
I wish I could get some pc3200. Those Twin Bank Corsair modules look really nice

I was lucky enough to get a week 45 JIUHB xp1700+ Thoroughbred B from newegg, which currently runs at 2.41 GHz with my EPoX 8RDA+. I am running 2 Crucial pc2100 modules at 192 MHz so I cannot get the fast memory timings. Running SETI on this, I was able to average 2 hrs 10 mins, but unable to hit sub-2 hr times (I didn't get those VHAR WUs )

I need to get a pair of pc3200 to see the real stats

What is that, like a 70% OC?!?!!

Found a site that specifically sells these: link

Just $100 Canadian (~$66 american). Not bad for something that goes over 2 GHz consistently!

 

[adeno]

Almost a 70% overclock.. yep

Those who received the Thoroughbred B JIUHB steppings generally get mixed results from o/cing - most have been able to push these xp1700s to 1.9GHz immediately.. some have been able to surpass 2.0GHz. Still others were able to push them further.. like my xp1700 running at 2.41GHz Seems like I got lucky and received one of the best overclocking xp1700's

I think more people have been getting better results overclocking the xp2100+ Thoroughbred B as most of those consistently hit 2.0 - 2.2 GHz.

 

[Assimilator1]

Which core version is this XP1700?

Btw I've got my XP1600 Pal @ 1.78GHz

 

[Actaeon]

Originally posted by: Assimilator1
Which core version is this XP1700?

Btw I've got my XP1600 Pal @ 1.78GHz

Looks like a Pally.