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2 pairs of TWIN2X2048-8500C5D on ASUS P5K-PRO


alakyr

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If you populate all four DRAM slots, then you are advised to drop the DRAM bandwidth and raise the memory controller voltage.

 

So, you are advised to drop the bandwidth to 800Mhz and raise the memory controller voltage +.2v.

 

The only memory Corsair supports in a four DRAM slot population is their Quad kits. This does not mean two dual kits or even worse two dual kits of different versions will not work together, just that you have no recourse to RMA Corsair if they do not work together. If there are problems with the DRAM modules, they are still supported via lifetime warranty, but that is for physical defects and errors in a two stick kit mode. Matched Quad sets are highly binned modules for a four slot population. The Dual sets are tested as a kit, not a Quad and warranted as a dual kit, not a Quad setup. You need to Memtest them as Kits (2 modules, not as a four DRAM slot population). If they fail as a kit or singly, then you have RMA. Keep in mind that there is no support for mixing and matching different versions of DRAM either since different version are of different fabrications and/or manufacturers. They might work, they might not work, but you have no support if they do not work. Thus you are advised to buy all the DRAM at the same time and in this way be more assured of getting the same versions. If you buy online, be sure to specify same versions of the modules and do not expect even then that they will work and again, no support unless you purchase a quad kit.

 

For a four DRAM slot population of 800Mhz DRAM you are advised to drop the bandwidth to 1066Mhz and raise the NB Voltage +.2v. You can then attempt to recoup some lost bandwidth via the CPU <--> MCH <--> DRAM overclock. Once stability is found, you can then, if you wish, attempt to regain some of the lost bandwidth of the CPU <--> MCH <--> DRAM stream with an overclock. First stability is necessary as some motherboards, even though they state a four slot population, will not work with stability on a four slot population and need to be RMA'd. So, first stabilty, then overclock.

 

Please research this thread:

 

http://www.houseofhelp.com/v3/showthread.php?t=64360&highlight=Unpredictable+results+QUAD2X4096+Gigabyte+X38-DS5

 

There is a limitation of the On Motherboard (Intel) memory controller or On CPU (AMD) and a population of all four banks at the full speed of a two bank run. This limitation is across the board with both AMD and Intel chipset based boards, DDR, DDR2 and DDR3.

 

Keep in mind that often issues can arise in the longer term even though you have shorter term stability. The issues seldom damage the DRAM unless you raise the DRAM voltage too high. They damage the on CPU (AMD) memory controller which has a harder time keeping up with the demands of a four DRAM slot population being run as fast as a two DRAM slot population. This is why you are advised to perform the DRAM lowering and MCH Voltage raising.

 

If you need help with specific settings I can set a template for you.

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i didn't buy 4GB in one time, coz i didn't think there was this kind of problem, and really, i didn't have enough money... anyway, till now i didn't have any problem, and i think they are set at 1066, but i should check... if you can write me down correct settings plz, you do me a favour!
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Download Memtest Version 2.11 from--->

and extract the ISO image. Burn the ISO image to an CD-ROM disk.

Download CPU-z from-->

Enter your BIOS and set to these values:

 

AI Overclocking: Manual

CPU Ratio Control: 9

FSB Frequency: 333

PCI-E Frequency: 100

DRAM Command Rate: 2T

DRAM Frequency: 800

FSB Strap to Northbridge: 333

DRAM Timing Control: Manual

 

CAS# Latency: 5

RAS# to CAS# Delay: 5

RAS# Precharge: 5

RAS# Activate to Precharge: 15

TWR: Auto

TRFC: 55

TWTR: Auto

TRRD: Auto

TRTP: Auto

 

DRAM Static Read Control: Auto

Transaction Booster: Auto

Clock Over-Charging Mode: Auto

 

CPU Spread Spectrum: Auto

PCIE Spread Spectrum: Auto

 

CPU Voltage: Auto

CPU Voltage Reference: Auto

CPU Load Line Calibration: Enabled

DRAM Voltage: 2.0v

FSB Termination Voltage: Auto

North Bridge Voltage: 1.4v

North Bridge Voltage Reference: Auto

South Bridge Voltage: Auto

 

USB

 

Legacy USB = Disabed For MemTest and enabled afterwards.

Run Memtest for two full passes, then (If Stable), enter Windows and post screenshots of CPU-z's CPU, Memory and SPD tabs.

 

 

i didn't buy 4GB in one time, coz i didn't think there was this kind of problem, and really, i didn't have enough money... anyway, till now i didn't have any problem, and i think they are set at 1066, but i should check... if you can write me down correct settings plz, you do me a favour!
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the first pair is v4.1

the second v6.1

>.<

 

EDIT: ram speed is setted @ 1066 and in the night the pc had run the memtest with this setting and it hadn't give any error (sorry for bad english u_u)

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