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Corsair 8500C5D IC UPDATE

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  • Corsair Employees

Effective immediately, Corsair will be using a new IC in addition to the current Micron ICs used in the Dominator 8500C5D modules. Due to increased demand for this speed grade we have obtained and qualified a new Qimonda 70nm IC that has been qualified for 8500C5D speeds. This change will be noted on the part number printed on the heat spreaders, all the Micron revision parts will remain marked as ver.1.x while the Qimonda will be marked ver.2.x.


As a nice side bonus, the Qimonda ICs can run 1066 MHz at lower voltage, so the spec on the new version has been changed from 2.2V to 2.1V. Also, due to characteristics of the Qimonda ICs, running four modules at 1066 MHz is significantly less challenging on most boards. If you have any questions or comments, feel free to post in this thread and we’ll answer them as soon as possible. Thanks again.


Additional DDR2 IC information can be found here:


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  • Corsair Employees

Hey guys!



This is the part of our announcement where I will inject some of the data from our lab. As already mentioned, the new 8500C5D is built with Qimonda DRAM chips. How to tell them from its Micron-based predecessor, you'd ask? Look at the label on a module pictured below, please. Two pieces of information need to be acknowledged, which indicate 8500C5D to be Qimonda-based:


2.1V nominal voltage and ver2.2 revision




I randomly selected one of the validated production kits and put it through extensive testing, then compiled some good data for easy viewing. For the testing platform, I chose Asus P5K Deluxe, based on Intel P35 chipset.



Test setup:

Asus P5K Deluxe, BIOS 0501

Intel C2D E6850, 3.00GHz, 1333FSB, 4MB L2

Corsair TWIN2X2048-8500C5D 2.1V ver2.2

eVGA 8800 GTS 640MB Superclocked

Corsair 620 HX PSU



Let's start off with BIOS configuration. Below you can see how the motherboard has been configured for the purpose of our lab testing. Those should be considered a guideline only, as some of the settings (e.g. CPU multiplier or FSB Frequency) might differ depending on a CPU end-user chooses to use.


BIOS --> Advanced -->JumperFree Configuration:

Ai Overclocking - [Manual]
CPU Ratio Control - [Manual]
Ratio CMOS Setting - [9]
FSB Strap to North Bridge - [Auto]
FSB Frequency - [333]
PCIE Frequency - [100]
DRAM Frequency - [DDR2-1067MHz]
DRAM Command Rate - [Auto]
DRAM Timing Control - [Manual]
CAS# Latency - [5 DRAM Clocks]
RAS# to CAS# Delay - [5 DRAM Clocks]
RAS# Precharge - [5 DRAM Clocks]
RAS# Activate to Precharge - [15 DRAM Clocks]
tWR - [Auto]
tRFC - [Auto]
tWTR - [Auto]
tRRD - [Auto]
tRTP - [Auto]
DRAM Static Read Control - [Auto]
Transaction Booster - [Auto]
Clock Over-Charging Mode - [Auto]
CPU Spread Spectrum - [Disabed]
PCIE Spread Spectrum - [Disabled]
CPU Voltage - [1.3500v]
CPU Voltage Ref - [Auto]
CPU Voltage Dumper - [Auto]
CPU PLL Voltage - [1.50v]
DRAM Voltage - [2.10v]
FSB Termination Voltage - [1.30v]
North Bridge Voltage - [1.55v]
North Bridge Voltage Reference - [Auto]
South Bridge Voltage - [Auto]



Default frequency DDR2-1066 5-5-5-15 @ 2.10v


Now, let's take a look at some stability tests performed at default 2.1v voltage. After our standard production test, I tested our setup with 2 as well as 4 DIMM sockets populated, 2GB and 4GB respectively, in OS environment. Stress test of choice is ORTHOS, which is a 3-rd party GUI for well respected Prime95. Additionally, I have performed some 3D testing and gaming at those settings, and system worked perfectly as well.



Important, and interesting at the same time is the fact that the new TWIN2X2048-8500C5D actually requires only 1.90v to operate properly on some motherboards, including eVGA 680i and Asus P5K Deluxe. Keep in mind however 2.1v is still this kit's official specification. Therefore consider ability to perform at 1.9v a "neat feature" that may be exclusive to selected few motherboards.



In this paragraph, I have compiled results of my overclocking attempts at default timings 5-5-5-15.


ORTHOS 24hrs - DDR2-1110 5-5-5 @ 2.10v ------- Dual SPi32M - DDR2-1120 5-5-5 @ 2.10v

http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/444x8_DDR2-1110_5-5-5-15_2GB_21v_ORTHOS_24hrs_4x3.gif http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_DualSPi32M_4x3.gif


SPi1M + SPi32M - DDR2-1120 5-5-5 @ 2.10v ------- Sandra XI - DDR2-1120 5-5-5 @ 2.10v

http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_SPi1M32M_4x3.gif http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_SandraMemBand_SandraMemLat_4x3.gif


PCMark05 Memory - DDR2-1120 5-5-5 @ 2.10v ------- WinRAR - DDR2-1120 5-5-5 @ 2.10v

http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_PCM05_Mem_4x3.gif http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_WinRAR_4x3.gif


3DMark2001 - DDR2-1120 5-5-5 @ 2.10v ------- 3DMark03 - DDR2-1120 5-5-5 @ 2.10v

http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_3DM01_4x3.gif http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_3DM03_4x3.gif


3DMark05 - DDR2-1120 5-5-5 @ 2.10v ------- 3DMark06 - DDR2-1120 5-5-5 @ 2.10v

http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_3DM05_4x3.gif http://www.clockmehigh.com/TestingAtCorsair/TWIN2X2048-8500C5_Qimonda/448x8_DDR2-1120_5-5-5-15_2GB_21v_3DM06_4x3.gif


----- Overclocking @ CL4 -----


I've also decided to take a look at these modules' overclocking potential when timings are tightened to 4-4-4-12. As shown, at around DDR2-900 system remained fully stable.




Thank you for your attention!

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I just RMA'd my 8500C5D's through buy.com. Do you think there's a chance I'll get a set with Qimonda chips in return?


If that happens, I'll be running 2x1 gigs of Dominators with Micron chips in them and 2x1 gigs of the Qimonda version. Do you have any recommendations for voltage/timing settings if I were to use this combo?


I'd love to get a set of RAM that runs the same settings at lower voltage, since my eVGA 680i has something of a RAM-fryer reputation. My current Dominators are underclocked to 900 MHz at CL5, 1.9V because of that. :wall:


Were the Micron chips manufactured using a 90 nm process?

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Were the Micron chips manufactured using a 90 nm process?


Micron D9's


D9GMH = 80nm,3ns

D9DQT = 90nm,3ns

D9DQW = 90nm,3.75ns

D9GKX = 80nm,2.5ns


D9DQT and D9DQW are called "Fatbody" because their chip size are fat with a 92-Ball Grid Array (BGA) vs a 60 BGA in GMH & GKX.

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  • 3 months later...


1. is the Qimonda IC update on the dominator 8500 c5d is better in all aspects then the micron version? since i`ve heard a lot of good things about micron ,and on some forum they wasn`t sure about it.

2.do you know when exactly they started marketung the revised version?

since it kind of argent to me i`ll apreciate your answer as soon as possible.

thank you

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