Any 2x2GB kits that have D9 chips?

[ghost recon88]

I can't seem to find any 2GB sticks that come with D9 chips. They all lower clocking stuff on them. I really want to get 2x2GB so I can run 1T, plus have the ability to upgrade in the future. Anyone know of any?

 

[ryderOCZ]

D9 that you and I are used to are 64x8 IC's, thus you cannot make a 2GB stick of ram out of them (would need 32 IC's) 2GB modules are made of 128x8 IC's.

Micron does make 128x8 IC's, but so far they don't have the same characteristics as the 64x8 D9.

In a nutshell, there are no 2x2GB kits that respond with voltage, etc like the 2x1GB kits we have now. OCZ does have a couple new 2x2GB kits that overclock quite nicely though: http://www.ocztechnologyforum....showthread.php?t=32305
http://www.ocztechnologyforum....showthread.php?t=32363

Hope that helps.

 

[Mr Fox]

Originally posted by: ghost recon88
I can't seem to find any 2GB sticks that come with D9 chips. They all lower clocking stuff on them. I really want to get 2x2GB so I can run 1T, plus have the ability to upgrade in the future. Anyone know of any?

Munchkin has the Hot Micron D9GMH XP2-6400 996580 (2x2GB)

They are a few more $ but they are well worth the investment.

They are the only maker fabricating that IC at this point.....

They are available direct http://www.mushkin.com/doc/pro...mory_detail.asp?id=634

and thru The EGG : http://www.newegg.com/Product/...x?Item=N82E16820146726

Unfortunately they are out of stock....

 

[ryderOCZ]

Mr. Fox.... D9GMH is not a 128x8 IC.

Those modules cannot have D9GMH on them.

http://ramlist.ath.cx/micron/

They may be D9xxx but they are not D9GMH.

You can cross reference any Micron FBGA code (right off the chip) here: http://www.micron.com/support/...ols/fbga/decoder.aspx#

 

[ghost recon88]

Well any form of D9 would be alright correct?

 

[ryderOCZ]

Certainly it will be fine...its just that the 2GB modules with D9xxx (if they even have that designation) are not going to be voltage loving super OC'ers like the 1GB modules of D9 that we all love.

Currently I have not seen any 2GB modules other than those 2 new kits from OCZ and a kit or two from the competition that overclock to 900+ speeds. The kits that do, you only need about 2.1 - 2.2V to do it.

The only point I was trying to make was that you shouldn't expect any 4GB kit of ram right now to run 900+ MHz, the IC's are starting to come into play that will, but there are not a lot of them out there yet.

 

[Mr Fox]

Originally posted by: ryderOCZ
Mr. Fox.... D9GMH is not a 128x8 IC.

Those modules cannot have D9GMH on them.

http://ramlist.ath.cx/micron/

They may be D9xxx but they are not D9GMH.

You can cross reference any Micron FBGA code (right off the chip) here: http://www.micron.com/support/...ols/fbga/decoder.aspx#

You are correct ! GMH was the hot tip in the lower density IC's


was a MisType D9GSV is the High density IC that Mushkin was fabbing I'm sure that that designation has probably built out, and progressed.


But they are the only ones that I know that are Fabricating Micron High Density IC's....

in 2x2 GIG.........



Micron : D9GSV is the current high density IC of Choice 2.0-2.2V@5-4-4-12

This is similar in rating that the popular D9GMH chips have, which are also based on the revD die. The difference lies within the density, and the number of banks.

To make a 2GB module with 16 chips, a 1Gbit chip must be used (1Gbit = 128MB). For 1GB modules with the same number of chips, 512Mbit chips are used. D9GMH is a 512Mbit chip, arranged in 64Mx8, which means each 'cell' is 64Mbits, and there are 8 'cells' per chip. 64*8 = 512Mbit.

To increase the density of the chip, either the number of cells (width) or size of the cells can be increased, or both. If the width is increased, less chips must be used per module. The total width of the module must be 64 or 128 for desktop memory. Using 16 chips, the 1GB and 2GB sticks in question must both use memory chips that have a width of 8. The only remaining option to increase the density is to increase the cell size from 64Mbit to 128Mbit. As such, D9GSV is arranged in a 128Mx8 layout.

However, there is an obvious tradeoff with doubling the size. Take a look in history at CPUs. When dual core processors were launched, they were found to be less overclockable than their single core counterparts. There are a few reasons for this, but the primary reason is that the dual core CPUs have twice the number of transistors. More transistors means more area, which in turn leads to a higher probability of defects that will limit clock speed.

Memory has the same exact problem, being based off very similar CMOS technology that CPUs use. For each bit in a DRAM device, there is a transistor and a capacitor. Every single transistor and capacitor has to be able to switch on and off, as well as drain or charge quickly, or data corruption will occur. So by doubling the capacity of the revD die from 512Mbit to 1Gbit, it is only natural to expect overclocking performance to drop significantly.

The 1Gbit chips have a trick up their sleeve though: Double the number of banks.

From Micron's technical documentation:

As with standard DDR SDRAMs, the pipelined, multibank architecture of DDR2 SDRAMs allows for concurrent Operation, thereby providing high, effective bandwidth by hiding row precharge and activation time.


In simple terms, DDR2's addressing methods allow multiple memory accesses at once, but only if they are in different banks:

A subsequent ACTIVE command to a different row in the same bank can only be issued after the previous active row has been closed (precharged). The minimum time interval between successive ACTIVE commands to the same bank is defined by tRC.

A subsequent ACTIVE command to another bank can be issued while the first bank is being accessed, which results in a reduction of total row-access overhead. The minimum time interval between successive ACTIVE commands to different banks is defined by tRRD.

DDR2 devices with 8-banks (1Gb or larger) have an additional requirement - tFAW. This requires no more than four ACTIVE commands may be issued in any given tFAW (MIN) period.

While the tFAW latency restricts the advantages, doubling the number of banks improves memory efficiency a bit. Splitting the data up into more banks increases the probability that two given sets of data are not on the same bank. Thus, a higher probability that when two access are made, the data for each are on different banks. As a result, total access time is reduced, improving latency and effective bandwidth.

So, the 1Gbit chips may not overclock as well, but at the same settings should provide slightly higher memory performance.

 

[Om51]

Here you go
STT DDR2-667 2GB/128x8 Micron Chip Memory
http://www.ewiz.com/detail.php?name=T667UB2G_M
$56.65 (X2) , with out shipping
It's D9 , which D9? you cann't know from the picture .

 

[PClark99]

Originally posted by: Om51
Here you go
STT DDR2-667 2GB/128x8 Micron Chip Memory
http://www.ewiz.com/detail.php?name=T667UB2G_M
$56.65 (X2) , with out shipping
It's D9 , which D9? you cann't know from the picture .

goddamnit, I bought 2 sticks of those 2 weeks ago from ewiz for $75 a pop.

They are D9HNL.

They did not work good in my Asus P5K VM.

In my Abit F-I90HD they work fine at DDR800.

 

[McCartney]

The Mushkins referred to here (the 996580 or whatever) do indeed run 1T at ddr800 at stock voltages.
I know because i have them and they run amazing. Stress tested at 1T with adv timings/voltages for 12 hours with 0 failures.
I heard these can clock to 1066 with ease on 2T + Eased timings.

Now to sell my 1066mhz kit

 

[n7]

I have the Mushkin 2x2 GB XP2-6400 4-4-4-12 kit.

Not overly impressed with it, but the lack of results might be due to my P5B-D's limited subtimings.

I can do around DDR2-980 5-5-5-15 2.1V

Can't hit DDR2-1000.