An interleave experiment

[Theo404]

Trying to get used to my new san diegos memory controller (a lot better than my venice for some reason), and I had a play with bank interleave because of suggestions from the DFI TCCD timming guide that san diegos may run more stable with bank interleave disabled. I cant comment on its effect on stability (YET, more to come) but this is a small test to show its impact on performance:

San Diego 3700 @ 2.754 1.504V
Gskill TCCD 4400 LE (440) @ 306mhz 2.5-4-3-7

Interleave Disabled:

sPi 1M:

1st run - 30.719
2nd run - 30.391
3rd run - 30.437

Sandra Memory Bandwidth:

1st run - 7598, 7509
2nd run - 7606, 7531


Interleave Enabled

sPi 1M:

1st run - 30.125
2nd run - 30.125
3rd run - 29.859

Sandra Memory Bandwidth:

1st run - 7661, 7573
2nd run - 7662, 7572


I was very suprised to drop into a lower second on the sPi runs just through enabling interleave, so rest assured, until I have data regarding its stability benifits with a san diego core I will be running it enabled.

Next I will try to evaluate its effect on stablility (in the same brief way) so stay tunned if your interested.

[Onepagebook]

if you run on 32m, you will be shocked.:)

[Stuperman]

is that node, bank or both?

[eva2000]

yeah bank interleave is a big boost!

[Lane-k]

I have see same thing... It's better having it enabled... Now.. I have heard too it can help stabilise with 2x 1Go of DDR...

For something totally different... I can have some G-Skill DDR...Some shop in UK delivery now to Switzerland...( for cheap difference)

Actually i have the OCZ 4800 Plat and have some trouble... I have finally see that: if the core of S-D is not totally stable at 300, it's better use 4400 DDR and OC them at the max they can... But i have see too only good result with the G-Skill PC4800 ( 1T version). WHat do you think about. The G- Skill 4800 will be good, or i try the 4400.?

Edit: looking at the site of G - SKill, i fall one thing for the DDR, settings tested on DFI ( Full bios DDR setting http://www.gskill.com/f1-4800dsu2ffsetup.html) + the F1 - 4800 DSU2-1GBFF is tested too for the 550Mhz (2.5-3-3-7 1T) The speed i search according to my CPU is near 276x11 at 300x10... What are you thinking.. a good idea to go with this one??

[Vapor]

You should see how much bank interleave helps when you double the DIMMs :banana:

with 2T for both 2xDS and 4xDS, of course

[MonkSP]

Yet I was expecting a larger diference. I guess its quite similar with spi 1mb

[MonkSP]

Yes, but since seems you are limited to 200 fsb with 1t in those 4 slots (considering oscar wold release that bios) and now you have 2Gb kits, I am not 100% sure of that boost.

[Vapor]

if you "COULD" lmfao 4x512 or 4x1024 at 1t and then do a compare via same cpu/fsb you would see another boost as you did from disabled to enabled as more banks=more bank interleavingYou could run 2T for both 2x and 4x to simply see the difference....or you could run 1T at like 190MHz ;)

Or you could get Oskar to post that BIOS that allows up to 203MHz (which I'm seriously considering for my 24/7 3GB setup).

[largon]

I've seen 2x1GB set provide more bandwidth than 2x512MB sets? Why?
Or am I imagining things?

[Lane-k]

Normal... If you have 2Go of physical memory... You will have more bandwith..
The bad thing, you need good DDR at 2Go, can be OC same as 1Go and with agressive timings.

[largon]

Normal... If you have 2Go of physical memory... You will have more bandwith..
The bad thing, you need good DDR at 2Go, can be OC same as 1Go and with agressive timings.1: Normal? Yes. I know it's normal, but why?
2: Using 2x 512Mb sticks at a specific speed and timings won't get any higher b/w than 2x 256Mb at same speed and timings. I don't see why 2x 1Gb would be an exception.
3: What is a "Go"? Never seen that one before.

Edit: Hmm. Go seems to be Gb in french...

[Zeus]

I think he means 1T and 2T.

[MonkSP]

I think that GO is that program that test stability like spi

[largon]

I think he means 1T and 2T.
But 1T isn't a problem with 2x 1Gb.
2x 1Gb is comparable to 2x 512Mb if we talk about Command rate.

[Vapor]

IIRC, Tony couldn't even explain WHY, only that it happened.

[Lane-k]

I think that GO is that program that test stability like spi


No Go is Gb . sometimes i make the misstake..