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16gb of memory on a Gigabyte EX58-UDR3

post #1 of 8
Thread Starter 
Having looked at someones problem on memory issues led me to write this thread -

I have a 16gb of Samsung memory but only use 12gb in triple channel setup on my Gigabyte EX58-UDR3. After checking this out on google and so many experts out there, there is no clear cut poll out there.

12 in tri is better than 16 in dual mode ?

Then read somewhere that it will still operate triple channel rolleyes.gif Odd? I'm lost
post #2 of 8
It's actually physically impossible for four DIMMs that are attached to three different memory channels to operate in dual channel mode on an LGA-1366 setup.

4x4GiB in the EX58-UD3R is triple channel for the first three DIMMs and single for the remaining one.

If you ever need more than 12GiB of memory, you are much better off using all four DIMMs (single channel is way faster than nothing at all, or a page file). If you are 100% certain than 12GiB is sufficent, the memory in the third memory channel can likely be OCed further or run at tighter timings with only one DIMM, but the difference is trivial.

I used to have an EX58-UD3R, and normally ran four DIMMs without issue.
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by Blameless View Post

It's actually physically impossible for four DIMMs that are attached to three different memory channels to operate in dual channel mode on an LGA-1366 setup.

4x4GiB in the EX58-UD3R is triple channel for the first three DIMMs and single for the remaining one.

If you ever need more than 12GiB of memory, you are much better off using all four DIMMs (single channel is way faster than nothing at all, or a page file). If you are 100% certain than 12GiB is sufficent, the memory in the third memory channel can likely be OCed further or run at tighter timings with only one DIMM, but the difference is trivial.

I used to have an EX58-UD3R, and normally ran four DIMMs without issue.

Thanks for the reply. 12 gig is enough. I got the samsung 16gig kit for future upgrade as it was so cheap at the time - £71

Now its £123. Have to pat myself on the back now biggrin.gif
post #4 of 8
Here is some good info for you to check out:
The Truth about i7 (1366) memory, both dual channel vs tri channel
Quote:
Originally Posted by Blameless View Post

It's actually physically impossible for four DIMMs that are attached to three different memory channels to operate in dual channel mode on an LGA-1366 setup.

4x4GiB in the EX58-UD3R is triple channel for the first three DIMMs and single for the remaining one.

If you ever need more than 12GiB of memory, you are much better off using all four DIMMs (single channel is way faster than nothing at all, or a page file). If you are 100% certain than 12GiB is sufficent, the memory in the third memory channel can likely be OCed further or run at tighter timings with only one DIMM, but the difference is trivial.

I used to have an EX58-UD3R, and normally ran four DIMMs without issue.

I never understood this. Is it that you get tri-channel performance until you access more than what the tri-channel can provide in terms of capacity, at which time the 4th module is accessed in dual channel mode? From what I read (its been a while), dual channel with 2 modules, and running 4 modules gives the same bandwidth.
Edited by ericeod - 5/17/13 at 12:26am
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post #5 of 8
Thread Starter 
ericeod - thank you as well, read your thread. That's poetry isnt it? biggrin.gif
post #6 of 8
Thread Starter 
I decided to add the other 4 gig of ram in the blue slot on my Gigabyte X58-UD3R. Strange thing is, in my bios I could only see dram timings for channel A, B and C and nothing else to indicate the other slot .

16 gig is registered by win7.

I also ran Aida64 with 12 then 16 gig - here are the results - overlapped images CR1 = 16 CR2 =12

So i can use 16 gig but CANNOT play with channel D as there is not one biggrin.gif
post #7 of 8
Quote:
Originally Posted by Blameless View Post

It's actually physically impossible for four DIMMs that are attached to three different memory channels to operate in dual channel mode on an LGA-1366 setup.

4x4GiB in the EX58-UD3R is triple channel for the first three DIMMs and single for the remaining one.

If you ever need more than 12GiB of memory, you are much better off using all four DIMMs (single channel is way faster than nothing at all, or a page file). If you are 100% certain than 12GiB is sufficent, the memory in the third memory channel can likely be OCed further or run at tighter timings with only one DIMM, but the difference is trivial.

I used to have an EX58-UD3R, and normally ran four DIMMs without issue.

Quick question / discussion point, and it relates to the info that is provided by ericeod in post #4, as well as what Blameless posted above.

It has been pretty much cleared up that dual-channel is comparable to tri-channel, performance wise, under most circumstances (ericeod's link), and I believe that Blameless is correct in his assertion (quoted above) that you can't run dual-channel mode with four modules if you have populated at least one of each of the tri-channel slots.

My question is this...wouldn't it make more sense to use the 4 modules by populating both slots of only two of the three available channels on the OP's X58 motherboard, rather than having it run tri-channel with 12GB and single-channel with the fourth module (flex-mode)? I would think that all 4 modules in dual-channel mode and taking full advantage of bank interleave, would result in the best performance for the majority of the applications.

http://www.intel.com/support/motherboards/desktop/sb/CS-011965.htm
post #8 of 8
Thread Starter 
Quote:
Originally Posted by ladcrooks View Post

I decided to add the other 4 gig of ram in the blue slot on my Gigabyte X58-UD3R. Strange thing is, in my bios I could only see dram timings for channel A, B and C and nothing else to indicate the other slot .

16 gig is registered by win7.

I also ran Aida64 with 12 then 16 gig - here are the results - overlapped images CR1 = 16 CR2 =12

So i can use 16 gig but CANNOT play with channel D as there is not one biggrin.gif
My IQ is lacking - so can anyone enlighten me on



So after reading the above can anyone enlighten about the bios not showing a D channel, I know the board is set up for Tri but yet strangely it has 4 banks and I cannot go in there and set timings. So would it set itself the same as the others?

Or is it just Ghost ram lachen.gif
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