On a faaast lane --> Corsair TWIN2X2048-6400C3 OCing Report on Socket AM2!

I found the information below interesting. What's with the variety of DIMM's all using the same IC's ("ProMOS 667MHZ, CL5, 0.09u 64Mx8 ETT") ?? Why pay extra for the 6400C4 when the cheaper standard 6400 uses the same IC's - is there any difference?

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Corsair IC Inquiry Thread
http://www.houseofhelp.com/forums/s...ead.php?t=44365

Value Select Modules
Value Select modules are built with RAMs that are procured at the wafer level and are packaged and tested to our specifications. As such, they are not available as individual ICs, only as modules. This approach allows us to ship product with very good performance characteristics, low product cost, and a very low return rate.

DDR2 - XMS
XMS, or eXtreme Memory Speed, is the process that Corsair uses to take ICs rated at one speed and verify/guarantee their operation at another speed. Since specifications have not been generated to accurately specify operating parameters, Corsair gives these parts an XMS rating. For example, since PC2400 does not exist according to any valid standards institution, Corsair parts are called XMS2400.

5400C4
CM2X1024-5400C4 XMS5402 v2.10 0628134-2 = Micron, 64Mx8, DDR2-533, CL4, Die Rev D
CM2X1024-5400C4 XMS5402 v5.2 0633071-3 = PCS DDR2, 675MHz, CL 4, 64x8 90nm ETT
CM2X1024-5400C4 XMS5402 v5.2 0633071-5 = PCS DDR2, 675MHz, CL 4, 64x8 90nm ETT
CM2X1024-5400C4 XMS5402 v7.1 0629230-11 = ProMOS 0.09u 64Mx8 ETT Rev E

6400
CM2X1024-6400 XMS6405 v1.4 0606096-2 = Micron, 64Mx8, DDR2-667, CL5, Die Rev D
CM2X1024-6400 XMS6405 v4.1 0609102-1 = Infineon AENEON, Die Rev B, 64M X 8 Rev B
CM2X1024-6400 XMS6405 v4.1 0626413-3 = Infineon AENEON, Die Rev B, 64M X 8 Rev B
CM2X1024-6400 XMS6405 v5.1 0634287-2 = ProMOS 667MHZ, CL5, 0.09u 64Mx8 ETT
CM2X1024-6400 XMS6405 v5.1 0631252-2 = ProMOS 667MHZ, CL5, 0.09u 64Mx8 ETT
CM2X1024-6400 XMS6405 v5.1 0631252-9 = ProMOS 667MHZ, CL5, 0.09u 64Mx8 ETT
CM2X1024-6400 XMS6405 v5.1 0633171-6 = ProMOS 667MHZ, CL5, 0.09u 64Mx8 ETT
CM2X1024-6400 XMS6405 v5.1 0629230-7 = ProMOS 667MHZ, CL5, 0.09u 64Mx8 ETT

6400C3
CM2X1024-6400C3 XMS6403v1.1 0619028-4 = Micron, 64Mx8, 2-667 CL5, Die Rev D

6400C4
CM2X1024-6400C4 XMS6404 v1.1 0626099-3 = Micron, 64Mx8, 2-667 CL5, Die Rev D
CM2X1024-6400C4 XMS6404 v1.2 0620097-1 = Micron, 64Mx8, 2-667 CL5, Die Rev D
CM2X1024-6400C4 XMS6404 v2.1 0635221-22 = ProMOS 667MHZ, CL5, 0.09u 64Mx8 ETT

6400PRO
CM2X1024-6400PRO XMS6405v1.1 0610028-1 = Micron, 64Mx8, DDR2-667, CL5, Die Rev D
CM2X1024-6400PRO XMS6405v3.1 0609115-2 = Infineon AENEON, Die Rev B, 64M X 8 Rev B
CM2X1024-6400PRO XMS6405v1.3 0610028-1 = Micron, 64Mx8, DDR2-667, CL5, Die Rev D

8500C5/C4
CM2X1024-8500C5 XMS8505v1.2 0620114-1 = Micron, 64Mx8, 2-667 CL5, Die Rev D
CM2X1024-8888C4D XMS8804v1.1 0634174-2 = Micron, 64Mx8, 2-667 CL5, Die Rev D

difference is binning and guaranteed speeds - binning is what makes it expensive

DDR2-667 CL5, Die Rev.D so it is Micron D9GMH

Any other D9GMH could do but to find exactly 2 Modules where 32 (2 times 16) unbinned chips meet those specs is almost impossible...

Interesting... how much are these?

:confused:

i´m talking about Die/IC/chip right now - not about modules...

if you´d like to know price for Corsair 6400C3 you´ll easy find out at any pricewatch

nubie question...what is binning?

testing the chips for speed

nice bachus_anonym :D

excellent work.. :D

:woot:

bachus- top review my man,
i have a question for you(and anyone else who's reading this), have you used any xms2-twin2x-pc2-8500c5.
i have a 2gb matched pair and am unsure of the actual chips used. i'd like to find out how far i can safely push them, and their max rated speed.
bit off topic but would appreciate any advice....

Quote:

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Originally Posted by kutujambak

nubie question...what is binning?

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"Speed binning" actually.

The contracted plant takes thousands of 667MHZ CL5 IC's, tests and sorts them into separate bins for 533MHz, 667MHz, 800MHz, 1000MHz ratings.

Later, Corsair tests the finished PCB's to refine them under standard, C3, C4, and Pro lables and then matches them into pairs of DIMMS with near-identical performance. That's my understanding (not that I've actually seen it).

Quote:

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Originally Posted by Clones123

"Speed binning" actually.

The contracted plant takes thousands of 667MHZ CL5 IC's, tests and sorts them into separate bins for 533MHz, 667MHz, 800MHz, 1000MHz ratings.

Later, Corsair tests the finished PCB's to refine them under standard, C3, C4, and Pro lables and then matches them into pairs of DIMMS with near-identical performance. That's my understanding (not that I've actually seen it).

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Pretty close to right, we do have some ability to test individual ICs in-house in Fremont, CA, and we do a lot of internal testing on various motherboards to verify this. You'd be surprised how something from a tester may say it does X MHz and when we put it on a motherboard sometimes it's twice or half that fast. Weird.

In order of easiest to make to hardest to make with Micron ICs.

5400C4
6400C5
6400C4
8500C5
6400C3
8888C4


Yield on the 6400C3 is very, very low. 8888C4 yield is about half of that.

When you are buying hundreds of thousands of ICs at a time and screening them for various grades, the labor and time can cost a pretty penny. So while the 8888C4 uses the same basic Micron IC that a 6400C4 might use, the challenge of screening them so extensively and getting enough to build parts that we can actually put in stores is so high that they have to be sold at a premium otherwise we'd never be able to keep up with demand and make a profit on them.

Quote:

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Originally Posted by Alonso

difference is binning and guaranteed speeds - binning is what makes it expensive

DDR2-667 CL5, Die Rev.D so it is Micron D9GMH

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What makes you think it's D9GMH?

It could be any D9XXX, no? :confused:

Quote:

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Originally Posted by MACMAC

What makes you think it's D9GMH?

It could be any D9XXX, no? :confused:

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D9GKX is 800 mhz CL5 :)

667 cas 5 is D9GMH's specification.

@clones123 and redbeard
thx for explaining

so the bottom line is...


8888C4 is the solid freekin 18K Gold D9GMH?? The creme de la creme of D9's? Combine that with a HiPro Maximizer and you've got 500+ @ 3-3-3

C

Quote:

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Originally Posted by Redbeard

In order of easiest to make to hardest to make with Micron ICs.

5400C4
6400C5
6400C4
8500C5
6400C3
8888C4

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Redbeard,

Corsair's 5400C4, 6400C5 and 6400C4 are all now made with ProMOS 667MHZ CL5 IC's and not Micron, right? Personally, I'm a big fan of Team Group memory from TankGuys.biz just because I can be sure it's Micron D9 IC's.

Source: Corsair IC Inquiry Thread
http://www.houseofhelp.com/forums/s...ead.php?t=44365

Quote:

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Originally Posted by Clones123

Redbeard,

Corsair's 5400C4, 6400C5 and 6400C4 are all now made with ProMOS 667MHZ CL5 IC's and not Micron, right? Personally, I'm a big fan of Team Group memory from TankGuys.biz just because I can be sure it's Micron D9 IC's.

Source: Corsair IC Inquiry Thread
http://www.houseofhelp.com/forums/s...ead.php?t=44365

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We build those modules with whatever we can build them with, and the ProMOS stuff is very good at lower frequencies right now, especially with the difficulty of finding enough Microns to build our other stuff.

Still, the stuff that doesn't pass at 8500C5 or 6400C3 will get downbinned once in a while and made into other parts.

Update on this memory!!

I have a pair of these amazing sticks.

Give them v2.5 and I got them with alittle air cooling to:

3.3.3.5 @ 990

WOW!! Ill post a screen shot later!

sorry to bump this thread, but are these available anywhere?

Hmm..
My sticks dun seem to like 3-3-3 settings..
But they take 3-4-3...
So i got no complains either.. :D