4x512 BH-5? Should I do it?

[eva2000]

no no..

4x dimms on 875P = PAT only enabled at 200fsb and disabled at 201fsb or higher

2x dimms on 875P = PAT enabled all the time regardless of fsb

i've tested

4x 512MB Hynix PC3200 D43
4x 512MB Corsair XMS3200C2v1.1 BH-6
4x 512MB Corsair XMS3500C2v1.1 BH-5
4x 256MB Corsair XMS3500C2v1.1 BH-5
4x 512MB Kingston HyperX PC3200 KHX3200/512 BH-5
4x 256MB Kingston HyperX PC3200 KHX3200K2/512 BH-5
4x 256MB ADATA PC4000
4x 256MB OCZ PC3500 Premiere

all on 875P disabled at > or = 201fsb

only can force 4 stick PAT on Abit AI7 865PE with 16beta bios, 17 bios won't work

[freecableguy]

ahh, well, who cares...can't have everything. PAT won't matter when I have 2GB of Corsair running at DDR500 2-2-2-5. HAHAHAHAHAH....mwhahhahahahaha....hahah...ahhhhh.. ..

[eva2000]

4 x 512MB XMS3500C2v1.1 won't go anywhere near DDR500 at 2-2-2-5 even with 3.6v i tell ya

[freecableguy]

We'll just see about that....I've got 2x512 there already...I don't see why I can't do it with 4x512...

I see now that you have done quite a lot of testing yourself...what is it you think that keeps the clocks down when you have 2GB installed?

[eva2000]

this is

4x 512MB XMS3500C2v1.1 BH-5 @ 220mhz 2-2-2-6 at 3.2v (the max they can do with that voltage to give you an indicator of the stress and difficulty of DDR500 goal)

2.4C/Abit AI7 16beta1 bios

with PAT enabled using NB Strap 667fsb and GAT = A-A-A-D-D







only 3 boards i tested handle any decent oc'ing with 4 sticks populated and best in order of degree of oc'bility with 4 sticks are

1. Albatron PX865PE PRO2 - no PAT but highly oc'able 4 sticks functioning
2. Abit AI7 - 4 sticks can force PAT enabled with certain bios but depends on ram
3. Asus P4C800-E - no PAT with 4 sticks but okay oc'bility

The memory controller/chipset on 865PE/875P boards can't handle 4 sticks that well particularly 4x 512mb vs 4x 256mb. Think of 4 stick oc'ing like that of when in past trying to do 2x sticks oc'ing on first rev 845* based chipset boards!

Worse 4 stick oc'ing board for me Epox 4PCA3+ rev1.1, example 4x 512MB Hynix PC3200 on Albatron PX865PE PRO2 max oc was 266mhz 3-4-4-8 at 2.85v no PAT, on Epox couldn't get stable with 4 sticks even at 217mhz 3-4-4-8 or any timings at any vdimm between 2.6-3.3v

[freecableguy]

Well, aparently there is a bigtoe BIOS hack that allows for continuted operating with PAT enabled with 4 DIMM slots filled. Can anyone point me in the right direction for this?

[macci]

I'd pretty much listen to eva2000 on this one. Just a tip

PAT won't matter when I have 2GB of Corsair running at DDR500 2-2-2-5.

that will be even more difficult than running the said 2x512 at 280 2-2-2-5..
The MCH/board design just can't do it.
But good luck anyways

btw, I just happend to test my P4C800-E w/ most aggressive mem settings yesterday running 2x512 and it wasn't 100% stable even at 200FSB (does ~3300MB/s unbuffered at 200FSB)
2x256MB would run 255-260 w/ same settings 3D Stable.

[saaya]

wow eva! thx for all those infos!

seriously eva, thats lotcircuits quality here if not even better, you should write articles! seriously!

[Mini]

Yup... i found it VERY interesting as well...

[eva2000]

thanks guys... just some info i picked up reading reviews and some testing of my own heh .. actually thought most of you folks already knew most of this

Originally posted by macci
I'd pretty much listen to eva2000 on this one. Just a tip


that will be even more difficult than running the said 2x512 at 280 2-2-2-5..
The MCH/board design just can't do it.
But good luck anyways

btw, I just happend to test my P4C800-E w/ most aggressive mem settings yesterday running 2x512 and it wasn't 100% stable even at 200FSB (does ~3300MB/s unbuffered at 200FSB)
2x256MB would run 255-260 w/ same settings 3D Stable.

what 2x512MB was that ?

with OCZ DDR Booster i have no probs running 2x512MB BH-5 up to 250-255mhz 1:1 2-2-2-6 but no droop mod or vAGP mod limits me here sigh

3.2EE @ 250fsb Corsair Hydrocool
2x 512MB OCZ PC3500 Plat LE BH-5 @ 250mhz 2-2-2-6





there's no doubt 2x 512MB BH-5 with 3.3-3.5v could do 250-260mhz 2-2-2-6 but 4 sticks usually requires good ram, 0.15-0.4v more vdimm and looser timings and/or good mem controller

845 chipset - nice 1 stick oc'ing
865/875 chipset - lovely 2 stick oc'ing
??? chipset - for awesome 4 stick oc'ing will it ever happen ?

[Reflex1]

I don't think 2 GB is needed ...unless for a gaming server or such I'd prefer a high OC /w 1 GB.

btw, i just picked up some new Corsair BH-5 too (2x256) ...off some n00b who didn't even know what it was ...for 70 bucks!!! so far does 220 2-2-2-5 @ 2.8v

[leotonch]

hi hi,

I have 2g 4x512mb BH-5 334WF, running together, 1st they can't o/c higher than 2 sticks.

For 4 sticks, P4C800D, PAT disabled after 200fsb no matter waht seetings in bios.
While my Epox 4PCA3+, bios 19/Mar/04 PAT is able to turn on at 233fsb. (but what a da_n new bios, 23/7/04 diabled all PAT function)

So, It really depends on the bios & the quality 875 chips.