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Author Topic: Not Understood - Spec = 1600MHz DDR3 (OC)  (Read 5875 times)

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Klaus.S

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Not Understood - Spec = 1600MHz DDR3 (OC)
« on: 18-January-10, 21:03:46 »

I do not understand this motherboard spec.

When I contacted a supplier for RAM, they suggested that only 1333MHz DDR3 was "tested" and that is what they recommended for RAM.

Is this RAM only functional for overclocked settings ?

Am I missing out on higher RAM bandwidth using only 1333MHz DDR3 ?

TIA
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #1 on: 18-January-10, 21:13:33 »

 What CPU and MB?

                      >> Posting Guide <<
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Klaus.S

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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #2 on: 18-January-10, 21:25:01 »

The spec is listed on a lot of motherboards.

I have the X48C.

I'm also looking at the 790GX-65 to build for someone else.

I'm just trying to understand this spec & obtain the fasted supported RAM, not here to brag about my motherboard.

Klaus
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #3 on: 18-January-10, 21:49:49 »

Here's a link to one.

It seems now I cannot find the same spec for the X48C, but I'll dig it up eventually.

This is for the 790GX-G65

http://www.msi.com/index.php?func=prodmbspec&maincat_no=1&cat2_no=&cat3_no=&prod_no=1739

DDR3 Memory DDR3 800/1066/1333/1600(OC) 

Just another note of confusion along the way ... while we are at this spec versus reality issue.

Spec = Max Memory (GB) 16 

Reality = KingMax FLGE85F-B8KG9 2GB (from the "test report")

from ...

http://www.msi.com/uploads/test_report/TR10_1739.pdf
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #4 on: 18-January-10, 23:19:31 »

DDR3 @ 1600 is an overclock spec.
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #5 on: 19-January-10, 02:50:44 »

"An overclock spec" doesn't explain enough for me.

1. Buy DDR 1600 RAM first, and then after it is installed one can enable one of the automatic overclock BIOS settings and then the RAM bandwidth will then work ?

Please elaborate.

I've built well over 30 motherboard types.  I simply do not understand.

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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #6 on: 19-January-10, 11:41:18 »

"An overclock spec" doesn't explain enough for me.

Most of the DDR3-1600 modules on the market use overvolted DDR3-1333 chips (CAS 8 or CAS 9).
The real DDR3-1600 chips have the timings 10-10-10-27 or 11-11-11-30 and they work at 1.5V.
And they are very expensive!
Here are the DDR3 chips made by ELPIDA:


p.s.
All the DDR3-1800 ... DDR3-2200 memory modules on the market use overvolted DDR3-1600 chips.
That's marketing ...  :grin:
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #7 on: 19-January-10, 15:00:11 »

Also, the overvolted, overclocked DDR3 designations have either EMP or XMP (Enhanced Memory Profiles or eXtreme Memory Profile) programed on the SPD, Serial Prescence detect, chip.  The settings for most of the DD3 1600 sticks sold to run at 1600, are using settings that are not compliant with the JEDEC specifications of volages and/or timings.
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Klaus.S

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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #8 on: 19-January-10, 21:46:24 »

Now this REALLY helps ! ! !

Thanks both Mike & RemusM !

I will keep this thread alive as parts arrive & I memtest the bandwidth.

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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #9 on: 25-January-10, 07:22:52 »

Perhaps this will help you. I copied it from the Intel white paper x48mem_319125.pdf.

Table 3-3. Intel® X48 Valid FSB/Memory Speed Configurations
Memory
Type /   
FSB DRAM Data/
Rate/
Single
Channel Peak
Bandwidth/
Dual Channel
Peak
Bandwidth
1600 MHz 1600 MT/s 12.8GB/s 25.6 GB/s
1600 MHz 1067 MT/s 8.5 GB/s 17.0 GB/s
1333 MHz 1333 MT/s 10.5 GB/s 21.0 GB/s
1333 MHz 1067 MT/s 8.5 GB/s 17.0 GB/s
1333 MHz 800 MT/s 6.4 GB/s 12.8 GB/s
1067 MHz 1067 MT/s 8.5 GB/s 17.0 GB/s
1067 MHz 800 MT/s 6.4 GB/s 12.8 GB/s
DDR3
800 MHz 800 MT/s 6.4 GB/s 12.8 GB/s
Note: The X48 Express Chipset does not support system memory frequencies that exceed
the frequency of the Front Side Bus. If memory with higher frequency capabilities than
that of the FSB is populated, the memory will be under-clocked to align with the FSB.
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #10 on: 25-January-10, 10:37:53 »

More interesting than the valid FSB/DRAM Speed Configurations are the actual specifications for the X48 memory controller, that can be found in this document:

http://www.intel.com/Assets/PDF/datasheet/319122.pdf

.... on the pages 18 & 19:

Quote
- Supports memory data transfer rates of 800, 1066, 1333, 1600MHz for DDR3. The
1600MHz memory support requires Intel ® Extreme Memory Profile (XMP) DDR3-
1600 DIMMs.


- Directly supports one or two channels of DDR3 memory with a maximum of two
DIMMs per channel. When using DDR3-1600 XMP DIMMs the X48 MCH supports
single DIMM per channel where DIMM1 is populated and DIMM0 is not populated


- I/O Voltage of 1.5V for DDR3-800, DDR3-1066, and DDR3-1333. DDR3-1600XMP
DIMMs use an I/O voltage of 1.9V.

This fact that Intel mentions "XMP", a "single DIMM per channel" population restriction and an operating voltage of 1.9V (0.4V above the industry standard specifications for DDR3) when DDR3-1600 modules are mentioned, cleary indidates that DDR3-1600 operation is to be considered an overclocked/overvolted rating which actually exceeds the native specifications.

After all, this explains why so many people run into stability problems when they are trying to operate their memory @DDR3-1600 on an X48 Chipset board.
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #11 on: 26-January-10, 02:49:41 »

Hey everyone First posting. Klaus.S... he's right about 1600 is OC. I have Corsair's DDR3 CMX4G3M2A1600C8 on this same board (x48c Platinum) I dont know enough about overclocking to say alot but I got this memory to just over 1400mhz and runs great enough for my taste for now cpu stays in the 30'sc. It just matches your cpu.
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #12 on: 15-February-10, 21:23:14 »

We are so close on the model of the Corsair XMS3, yet so far away on the performance results.

My stick is the   CMX4GX3M2A1600C9   --- one CL lower ?

1.65v

ver 2.3

I bench tested it in MemTest 4.00 for over a week, getting over 4 tests of 80 +/- passes each time with no errors.

I had to bump the voltage up into the red zone.

Then when the video card arrived, I had a whole bunch of issues.  I focused on the video card and until I solved that by putting it into an ASUS P5Q, proving nothing was wrong with the video card.

So I started re-running MemTest 4.00 again, and I would come up win an error, but only after 20 passes.  About 1 error after each 20 passes, always test 7.

I was going to post a photo of the screen, but I can't see how to do that.

It's been two weeks of grief attempting to complete the MSI X48C Platinum and actually start using it.

I'm not impressed with the bandwidth either.

MemTest reports:

Core 2 3600 MHz
L1    50,704 MB/s
L2    23,529 MB/s

RAM  5,863 MB/s

I get more on L1 & L2 on the ASUS P5Q with a slower CPU and almost the RAM bandwidth of low latency Kingston DDR2 800 !

So now I'm WAITING to hear from Corsair to see what that problem is all about & how to resolve it.

Re: posting photos.  Do they have to go up on a site somewhere & just linked to ?
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #13 on: 16-February-10, 00:08:47 »

Just happened to look here again today. This board is something else!! I try not to over clock cause I dont understand it all. But what I did was
used opt. defaults, upped the 333x8.5 to 354x8.5 and set to t2 every thing else auto. Everything is running fine and cool. even games and I think
close to the 1600 specs not to care. I'd insert a screen shot of memset and cpu-z but dont know how It shows mem at 709. dual ch = 1418mhz.
I'am also running a Q9550
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #14 on: 16-February-10, 00:19:36 »

 "I'd insert a screen shot of memset and cpu-z but dont know how"

 Most use Photobucket

   >> How to use forum software features <<
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #15 on: 16-February-10, 02:40:23 »

Thanks Henry
I'll try to post here we go



--I made your image clickable. Click Modify in this post
  to see how I did it.

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« Last Edit: 16-February-10, 06:58:46 by Mike »
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #16 on: 16-February-10, 02:43:41 »

But now how do we read that small? How to make bigger?
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #17 on: 16-February-10, 06:57:28 »

First, you need to host a larger image. Second, make the image clickable, as a link to the larger image.  Click Modify in your post to see how I made the image clickable for those not using Firefox.
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #18 on: 16-February-10, 07:40:36 »

My stick is the   CMX4GX3M2A1600C9   --- one CL lower ?
1.65v

As I told you before, they are DDR3-1333 (9-9-9-24 at 1.5V).
That's their real speed.
Make them work stable at 1333MHz (raise the voltage to 1.55-1.60V) and be happy.
 :grin:
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Re: Not Understood - Spec = 1600MHz DDR3 (OC)
« Reply #19 on: 16-February-10, 23:57:56 »

But now how do we read that small? How to make bigger?


 You can start by only taking a screenshot of each open window by Alt+PrtScn instead of entire screen by only PrtScn. Multiple windows open on the screen and then showing entire screen is a poor way to do it. You can also use 'Snipping tool' instead of PrtScn if you are using Vista or W7.
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