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For those planning on populating all 4 dimm slots on i875....

F

fkloster

Diamond Member
don't do it. I tried to do it and run my PC-4000 Corsair TwinX @ its advertised speed of 500mhz and the computer failed to get to desktop. I removed the dimms from slot 2 & 4 and walla... now it even runs @ 532. Please make a note of it...
 
Originally posted by: fkloster
don't do it. I tried to do it and run my PC-4000 Corsair TwinX @ its advertised speed of 500mhz and the computer failed to get to desktop. I removed the dimms from slot 2 & 4 and walla... now it even runs @ 532. Please make a note of it...
Click to expand...

bummer...how will you ever get by on just 1gb of ram?
 
I think it doesn't accepted double sided memory if you try to populate all four slots. You have to use single sided because it only accepts up to four banks. Double-sided memory chips count as two banks.
 
Originally posted by: AmdInside
I think it doesn't accepted double sided memory if you try to populate all four slots. You have to use single sided because it only accepts up to four banks. Double-sided memory chips count as two banks.
Click to expand...

 
I posted a problem about using up all 4 dimm slots for the gigabyte 7n400 and came up with numerous responses. Some told me to run a memtest and sync the fsb with the ram, even if that meant lowering your ram speed. Then i read on overclockers.com that a lot of people have the same problem of filling all dimm slots on any motherboard. some require registered ram if you're gonna use more than 2 modules. Corsairmemory.com has a recommended module install table (for mine it didn't suggest using more than a pair of xms). Some required the mentioned SS dimms on all four. It also has come to fact that having more dimms causes instability and the signal to noise ration is pretty bad. I wish i had just purchased 2 x 512 instead of 4 x 256.
 
Originally posted by: xenos500
Originally posted by: AmdInside
I think it doesn't accepted double sided memory if you try to populate all four slots. You have to use single sided because it only accepts up to four banks. Double-sided memory chips count as two banks.
Click to expand...
Click to expand...

Read the manual...says nothing of this 'single sided...double sided' thing if using any # of banks...

 
Originally posted by: shady06
which board do u have exactly?
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I have the Abit IC7-Max3 but from all the threads I have been seeing....i875 don't love having all 4 banks populated. It works.... just not as advertised in the manuals...
 
Does it work at default speed with default timings with all four slots populated? If so, this does not indicate a design problem!

There are two solutions...

1) Use 1 GB modules
2) Stop overclocking!

1GB modules will probably not give you the speeds/timings you desire as well. I would much rather have 2GB with lesser timings then settle for 1GB that's only detectably faster in benchmarks, but that's me. Actually, I find that 4GB isn't even enough! Then again, that's in my use.

Cheers!
 
Does it work at default speed with default timings with all four slots populated?
Click to expand...

No. It does not. With all four banks populated...the fancy Corsair TwinX 500mhz memory will NOT run @ 500mhz stabily...

When I run my system @ 12X250 = 3.0 ghz and memory should be 2X250 = 500mhz.... It will not post....when I empty the 2nd and 4th banks....it posts and runs. riddle me that!
 
It's fairly well known issue with many mobos. They are not too many manufactures that have been able to pull of having all 4 banks filled and overclocking. There are just too many timing issues. As a matter of fact, most mobo manuf. will tell you to use slower memory if you plan on filling all four banks.
 
Originally posted by: fkloster
Does it work at default speed with default timings with all four slots populated?
Click to expand...

No. It does not. With all four banks populated...the fancy Corsair TwinX 500mhz memory will NOT run @ 500mhz stabily...
Click to expand...

I do not think he was referring to 500mhz!!! Rather the std. speed of your CPU FSB!
 
isnt the max officially supported speed on that mobo pc3200? just cuz the mem is rated at that speed doesnt mean the board can handle all 4 slots populated at htat speed. drop the mem speed to 3200 and then see what happens
 
Originally posted by: Need4Speed
inst the max officially supported speed on that mobo pc3200?
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Hmmm, well it depends on what bus your talking about.... Max 'supported' speed for the CPU bus to the system memory is 800fsb..... the max 'supported' speed of the system memory is 400mhz (200 x 2) Good question.....only problem is the board runs predictably when two banks are populated and underperforms when 4 banks are populated in my case...that is a fact. I guess you have a point though....the memory runs fine @ 400mhz 🙁

 
Originally posted by: shuttleteam
Does it work at default speed with default timings with all four slots populated? If so, this does not indicate a design problem!

There are two solutions...

1) Use 1 GB modules
2) Stop overclocking!

1GB modules will probably not give you the speeds/timings you desire as well. I would much rather have 2GB with lesser timings then settle for 1GB that's only detectably faster in benchmarks, but that's me. Actually, I find that 4GB isn't even enough! Then again, that's in my use.

Cheers!
Click to expand...


What are you running that uses 4GB+ of RAM? :Q

Nate
 
Originally posted by: fkloster
Originally posted by: Need4Speed
inst the max officially supported speed on that mobo pc3200?
Click to expand...

Hmmm, well it depends on what bus your talking about.... Max 'supported' speed for the CPU bus to the system memory is 800fsb..... the max 'supported' speed of the system memory is 400mhz (200 x 2) Good question.....only problem is the board runs predictably when two banks are populated and underperforms when 4 banks are populated in my case...that is a fact.
Click to expand...

thats because the memory timings are much more complicated with all 4 banks filled than with only 2 banks filled.
also, the cpu is quad-pumped 4x200=800 and the mem is dual pumped (DDR) 2x200=400fsb.
 
Read the manual...says nothing of this 'single sided...double sided' thing if using any # of banks...
Click to expand...

no, but it clearly states pc3200 ram to be used. if it does not run 4 sticks at 400mhz, then you have a legit complaint, otherwise youll have to choose speed over quantity.
 
What are you running that uses 4GB+ of RAM?
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Nothing. TweakXP is a program that I use to load the OS entirely into system memory and that is kind of cool 🙂 Other than that nothing... I was only running 2GB btw...
 
Originally posted by: fkloster
What are you running that uses 4GB+ of RAM?
Click to expand...

Nothing. TweakXP is a program that I use to load the OS entirely into system memory and that is kind of cool 🙂 Other than that nothing... I was only running 2GB btw...
Click to expand...


he was talking to NTB not you
 
When did you presume that using all 4 dimm slots would yield to a stable pc4000 system? The less slots you use, the more stable a PC platform is (exlcuding dual channel since both slots have to be used) Buy ram with More memory and fill up the two spots. More memory slots filled uses more power, address, cycles. Keep the RAM to a minimum.

BTW.. is 875P RAM limit 2GB, while 865P is 4 GB? I thought that was the case in all 875P.

I'd opt for 865 myself, more options to change ram speed and use different processors.
 
BTW.. is 875P RAM limit 2GB, while 865P is 4 GB?
Click to expand...

No. i875 can have 4 banks populated w/1GB each = 4 GB total

When did you presume that using all 4 dimm slots would yield to a stable pc4000 system?
Click to expand...

Well, I 'presumed' that when I read the specs for the IC7-MAX3..... its really an overclockers dream...I just thought I could do it w/four banks populated as I have an aversion to purchasing 1GB dimms...
 
it can do 4 banks, but not at 500mhz. its not the memory's speed thats limiting you, but rather the mem controller on the board. ill be surprised if you can get all 4 banks to run much faster than 400mhz....thats just the way it is. its no coincidence that most mobos only sport 3 dimm slots....
 
I have all 4 banks populated with single sided Crucial running 220fsb. 4x256

Maybe its because they are single sided.

I might add that this is 275fsb using the 5:4 divider and not 1:1 on an Abit IC7
oc'ing with only 2 sticks did not result in any more speed.

 
NIce info Fk!!!! I was thinking for monetary cost getting 2 sticks of 256mb of pc3700 now to get started with my DCDDR mobo (likely going to be an asus p4p800) and get another 2 sticks later for 1gb....It seems now maybe I should bite the bullet and get 2 sticks of 512mb of pc3500 or pc3700 (whatever I can afford.)

Maybe get another stick of my version 1.1 corsair pc3000 since this stick runs 450 at cas 2.5,3,3,7....With 2 I should hopefully be able to run 430's....
 
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