rexq Posted October 13, 2007 Share Posted October 13, 2007 i have a set of corsair xms TWIN2X2048-6400 and i wanted to get another set, i was thinking about the corsair dominator TWIN2X2048-6400C4D. just wondering if they are compatible together. thanks please let me know. Link to comment Share on other sites More sharing options...
DerekT Posted October 13, 2007 Share Posted October 13, 2007 i have a set of corsair xms TWIN2X2048-6400 and i wanted to get another set, i was thinking about the corsair dominator TWIN2X2048-6400C4D. just wondering if they are compatible together. thanks please let me know. It's not a good idea to mix and match DRAM. With one set being 6400C5's and the other set being 6400C4's, this means that these IC's need to be check to be certain that they are the same chips. Then, you do not state the model of your ECS board, but I have seen many of these tier 2 motherboards not make 4 X 1024MB strips of DRAM. This is even with the DRAM being dropped a speed from 800Mhz to 667Mhz. If you are lucky, and it works, then you likely would have to drop to 667Mhz. My advice would be to sell the 2 X 1024 strips and buy 2 X 2048 strips. There are just far less possibilities of incompatibilities. Link to comment Share on other sites More sharing options...
rexq Posted October 14, 2007 Author Share Posted October 14, 2007 sorry, yeah im planning on upgrading the mobo cause ecs just plain sucks anyways. thinking about the msi k9a platinum or the asus m2r32-mvp 580x. i just just assumed that they would be the same chip with different timings and head spreaders but i guess im wrong. thanks for the info. looks like selling is my best option Link to comment Share on other sites More sharing options...
Dazz Posted October 15, 2007 Share Posted October 15, 2007 Crap i wish i saw this before i had ordered the XMS2 6400C5, got it today works fine in single channel with 3GB but refuses to boot with all 4 slots populated. I wanted to buy some more Dominator PC6400C4 ram but they are hard to get round here as of recent. Link to comment Share on other sites More sharing options...
Dazz Posted October 15, 2007 Share Posted October 15, 2007 Crap i wish i saw this before i had ordered the XMS2 6400C5, got it today works fine in single channel with 3GB but refuses to boot with all 4 slots populated. I wanted to buy some more Dominator PC6400C4 ram but they are hard to get round here as of recent. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted October 15, 2007 Corsair Employees Share Posted October 15, 2007 With 4 modules and the CPU you have listed you would need to set the memory frequency at DDR533/266 MHz and over clock the CPU to the close to the tested settings of the memory. Link to comment Share on other sites More sharing options...
rexq Posted October 18, 2007 Author Share Posted October 18, 2007 wow, really that bad? damned is there any better way around it? i mean if i just get 4 dominator sticks then id be fine right? i can run those at ddr800 with my processor? or is my processor not able to handle? so if i use the dominator with the xms then that's when ill need to downclock the ram correct? im confused a little. Link to comment Share on other sites More sharing options...
rexq Posted October 18, 2007 Author Share Posted October 18, 2007 wow, really that bad? damned is there any better way around it? i mean if i just get 4 dominator sticks then id be fine right? i can run those at ddr800 with my processor? or is my processor not able to handle? so if i use the dominator with the xms then that's when ill need to downclock the ram correct? im confused a little. Link to comment Share on other sites More sharing options...
DerekT Posted October 18, 2007 Share Posted October 18, 2007 wow, really that bad? damned is there any better way around it? i mean if i just get 4 dominator sticks then id be fine right? i can run those at ddr800 with my processor? or is my processor not able to handle? so if i use the dominator with the xms then that's when ill need to downclock the ram correct? im confused a little. It's more than likely that you will have to drop from 800Mhz to 667Mhz if you populate all four DRAM banks with 6400 (800Mhz) DRAM. Some get lucky and are able to make the full speed but it is seldom this does happen. The memory controller can not keep up with the extra DRAM at the rated 800Mhz speed. You will need to drop the speed of the DRAM from 800MHzMhz to 667Mhz. If you had purchased 4 X 1024MB of PC8500 (1066Mhz) DRAM, then you would have had to drop to PC6400 (800MHz) DRAM, etc. Think of it this way. If you have a small phone book, then when you go into the index to find the page where you will find the phone number you are doing so at a certain speed due to the pages of the Index. Then you have to drive through the pages to get to the number. Now if your index is twice as large and the pages twice as many, then it takes longer to access the data. Now DRAM has a Strobe and the length of the strobe is how long the rows and columns can be left open before they must be refreshed. There is not enough time for the dram to be refreshed and then accessed with 4GB at the full access speed of the DRAM. The chipsets are optimized for 2GB, not 4GB and for 2 DRAM slots, not 4 DRAM slots populated. You can overclock the FSB (and hence the Memory Controller Hub = MCH) to gain some extra bandwidth and thus access the capabilities of the DRAM since the chipset is now clocked up. Usually when you clock up the FSB and concurrently the Memory Controller Hub (MCH) you need to raise the voltages of the CPU/MCH a bit as well. damned is there any better way around it?2 X 2048 will not issue this problem. This is a problem of all 4 banks being populated. Link to comment Share on other sites More sharing options...
DerekT Posted October 18, 2007 Share Posted October 18, 2007 wow, really that bad? damned is there any better way around it? i mean if i just get 4 dominator sticks then id be fine right? i can run those at ddr800 with my processor? or is my processor not able to handle? so if i use the dominator with the xms then that's when ill need to downclock the ram correct? im confused a little. It's more than likely that you will have to drop from 800Mhz to 667Mhz if you populate all four DRAM banks with 6400 (800Mhz) DRAM. Some get lucky and are able to make the full speed but it is seldom this does happen. The memory controller can not keep up with the extra DRAM at the rated 800Mhz speed. You will need to drop the speed of the DRAM from 800MHzMhz to 667Mhz. If you had purchased 4 X 1024MB of PC8500 (1066Mhz) DRAM, then you would have had to drop to PC6400 (800MHz) DRAM, etc. Think of it this way. If you have a small phone book, then when you go into the index to find the page where you will find the phone number you are doing so at a certain speed due to the pages of the Index. Then you have to drive through the pages to get to the number. Now if your index is twice as large and the pages twice as many, then it takes longer to access the data. Now DRAM has a Strobe and the length of the strobe is how long the rows and columns can be left open before they must be refreshed. There is not enough time for the dram to be refreshed and then accessed with 4GB at the full access speed of the DRAM. The chipsets are optimized for 2GB, not 4GB and for 2 DRAM slots, not 4 DRAM slots populated. You can overclock the FSB (and hence the Memory Controller Hub = MCH) to gain some extra bandwidth and thus access the capabilities of the DRAM since the chipset is now clocked up. Usually when you clock up the FSB and concurrently the Memory Controller Hub (MCH) you need to raise the voltages of the CPU/MCH a bit as well. damned is there any better way around it?2 X 2048 will not issue this problem. This is a problem of all 4 banks being populated. Link to comment Share on other sites More sharing options...
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