Max HTT/FSB depends on type of ram used?

[MTDEW]

Ok, doing some experimenting here and getting some odd results.

I have two types of ram here to experiment with.

2x512 of Kingston DDR433
2x1024 of Corsair Value select DDR400

Now to find my max HTT/FSB i set the ram to 100, multiplier to 5 and HT to 2x.
This is to take cpu and ram out of the equasion and isolate the fsb of course.

Then i boot to my desktop.
open prime95, and start an "in-place fft" torture test.
increase the FSB (HTT) with clockgen 2-3mhz every 15-30 seconds

With the corsair ram my fsb locks or reboots at 228fsb!
With The Kingston i get up 280fsb before lock or reboot.

So i experimented a bit farther using the Kingston and changed the timings from spd to
8-3-3-3 2t to see if the fsb would go farther.....nope with the more relaxed timings it tops out at 240fsb.

Odd how when i'm actually trying to take the memory out of the equasion that it still seems to have an effect.

My best "guess" is it has to due with my cpu's memeory controller.

So from seeing this it seems that the "type" of memory could limit OCing potential of the cpu. (a higher fsb can result in higher overclocks due to not being able to raise the multiplier)

Can anyone else who has extra sticks to try verify that this happens on their setup also.

I just dont fully understand how having the memory WAY underclocked it still has an effect on the HTT/FSB!

 

[RichUK]

1Gig sticks are never as versatile as 512 sticks .. that might be your problem .. but i dont know as the RAM is supposed to be out of the question with regards to your isolation ... crappy mem controllers maybe ??

try a divider that keeps them more to spec (ddr400) instead of lowering it that much


(just skimmed through)

 

[MTDEW]

crappy mem controllers maybe

Thats what im guessing.

And the whole thing that had me start this was using a divider that kept my ram in spec (right at 400mhz) and the 1024 sticks wont post but the 512 ones will.

Which kinda makes my dividers WORTHLESS!
note: trying various modded bios's now with the TRFC timing fixes, hoping it helps.

 

[RichUK]

Originally posted by: MTDEW

crappy mem controllers maybe

Thats what im guessing.

And the whole thing that had me start this was using a divider that kept my ram in spec (right at 400mhz) and the 1024 sticks wont post but the 512 ones will.

Which kinda makes my dividers WORTHLESS!
note: trying various modded bios's now with the TRFC timing fixes, hoping it helps.

yes i definitely recommend trying different BIOS revs .. as i tried 1.3, 1.4 and mod, 1.5 and mod, and now 1.8 and i am finally able to get cas 2.5 *FEWH* finally able to reach it after being constantly mem test stable through all the BIOS's except PRIME95 blend test .. 😀


this is where i get all of my BIOS's from, mods as well 😉

 

[MTDEW]

Been through most of the bios's last couple of days.

No luck with the 1024 sticks even with dividers, its like my winnie hates these sticks once i start trying to use a divider at all.

Which to me me is still just plain "odd" , if i use a divider to set ram at default speeds, i have no idea why it craps out!

But as i stated earlier with my 2x512 sticks all is fine.

Think im gonna see how far i can throw these two sticks of generic corsair ram! 😉

Even asked Corsair if they had any timing/ voltage selections that may help.
The said "In our lab tests we've never found the Msi Neo2 Platinum to be stable over 230HTT".
Yeah, right, i can prime all day on 280 when their ram isnt in my pc!

 

[RichUK]

its beyond me .. the only hing i can think of is the mem controllers .. anyways good luck in you venture, hope it works out, i know how annoying it can be :thumbsup:

 

[MTDEW]

I'll find out about the mem controller, i have a Venice 3000+ arriving monday for another build, i'm gonna throw that in here and see what happens.

If not, i guess if i want 2gb of ram in my winnie, i'm gonna have to try and hunt down some better sticks.
Sucks because there arent that many 1gb sticks available and if i'm gonna spend $200-$300 on some ram, i like to "KNOW" it will work.


BTW: b4 someone asks, i did try the sticks indiviually and in different slots.