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Help Upgrading my RAM


tharp22

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I currently have 4GB of Corsair XMS2 DDR2 800 PC2 6400 (4x1GB) installed in my PC. I want to upgrade to 8GB, meaning 4x2GB, and I'm having a little trouble deciding which direction to take.

 

Do I stick with Corsair XMS2 DDR2 800 PC2 6400 @ 5-5-5-18? (TWIN2X4096-6400C5)

http://www.newegg.com/Product/Product.aspx?Item=N82E16820145184

 

Or do I upgrade to the Corsair XMS2 DHX @ 4-4-4-12? (TWIN2X4096-6400C4DHX)

http://www.newegg.com/Product/Product.aspx?Item=N82E16820145194

 

It appears there are no regular 2GB XMS2's @ 4-4-4-12.

 

Basically, it will be double my money to upgrade to the XMS2 DHX instead of just the XMS2. Will I see a noticeable difference?

 

Thank you ahead of time for any opinions or advice.

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DHX is just the memory form factor. If you have 6400C5, then it is best to use 6400C5 and NOT mix and match models or versions.

 

If you populate all four DRAM slots with 2GB modules, then you are advised to drop the DRAM bandwidth and raise the memory controller voltage.

 

So, you are advised to drop the bandwidth to 667Mhz.

 

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 667Mhz 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 stability, 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.

 

 

I currently have 4GB of Corsair XMS2 DDR2 800 PC2 6400 (4x1GB) installed in my PC. I want to upgrade to 8GB, meaning 4x2GB, and I'm having a little trouble deciding which direction to take.

 

Do I stick with Corsair XMS2 DDR2 800 PC2 6400 @ 5-5-5-18? (TWIN2X4096-6400C5)

http://www.newegg.com/Product/Product.aspx?Item=N82E16820145184

 

Or do I upgrade to the Corsair XMS2 DHX @ 4-4-4-12? (TWIN2X4096-6400C4DHX)

http://www.newegg.com/Product/Product.aspx?Item=N82E16820145194

 

It appears there are no regular 2GB XMS2's @ 4-4-4-12.

 

Basically, it will be double my money to upgrade to the XMS2 DHX instead of just the XMS2. Will I see a noticeable difference?

 

Thank you ahead of time for any opinions or advice.

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