Philippe224 Posted October 24, 2007 Share Posted October 24, 2007 hello I have buy 4g of cm2X1024-6400 and my computer is not stable. When I use the 4g the computer do not start and if I start I shut down automaticy with a blue screen. If I run only 2g every thing is stable and I dont have any problem. My board is a M2N4-SLI asus. Link to comment Share on other sites More sharing options...
DerekT Posted October 24, 2007 Share Posted October 24, 2007 With four banks you will very likely need to drop your DRAM throughput from 800Mhz to 667Mhz. The motherboard memory controller is having issues with 4 DRAM banks filled. This is very common as most motherboards are optimized for two banks filled. The memory controller can not keep up with the extra DRAM at the rated 6400 speed. You will need to drop the speed of the DRAM from 800Mhz 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. 2 X 2048 will not issue this problem. This is a problem of all 4 banks being populated. 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. Think of it like a car that is slated to run the 1/4 mile in 10s. If you add another few thousand pounds to the car, it will not make the 1/4 mile in 10s. The DRAM needs to be slowed down, to keep up with the onboard memory controller. Link to comment Share on other sites More sharing options...
amirem Posted October 25, 2007 Share Posted October 25, 2007 true Derek, had the same problem :[pouts: tuned back to 2x1GB and used the extra set in other PC Tried using 4GB at lower clock (667) But why downclock if it runs stable @ 900Mhz , 4-4-4-12 , 2.1V with 2 GB ? Or am i wrong , and should i use 4GB @ 667 ? like to compare it to automobile highways : rather drive at 150MPH on two lanes , than 100MPH on 4 lanes ... any comment is welcome , ofc Link to comment Share on other sites More sharing options...
DerekT Posted October 26, 2007 Share Posted October 26, 2007 But why downclock if it runs stable @ 900Mhz , 4-4-4-12 , 2.1V with 2 GB ? Or am i wrong , and should i use 4GB @ 667 ? like to compare it to automobile highways : rather drive at 150MPH on two lanes , than 100MPH on 4 lanes You are correct. I would run 900MHz with 4-4-4-12 and 2GB than 4GB @ 667. For normal gaming and pc use the extra 2GB is mostly superfluous at any rate. The normal use will be slower with 4GB @ 667 than 2GB @ 900Mhz. Link to comment Share on other sites More sharing options...
Philippe224 Posted October 26, 2007 Author Share Posted October 26, 2007 Ok so what is the perfect setting in the bios for 2g and 4g. Sorry for the question but I'm a newby. I was wondering if my 800mhz memory can really go to 900mhz with no problem. Do I have to overclock or boost my front bus. My board is a M2N4-SLI and my processor is a AMD 2.80 core duo FX. I cant not go at more than 1.95v for the draw or maybe I just don't no how lolll. thx Link to comment Share on other sites More sharing options...
DerekT Posted October 26, 2007 Share Posted October 26, 2007 Set your DRAM to 667Mhz for 4GB (4 slots) and hope it works. Set to 800Mhz for 2GB (2 slots) and it will work. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted October 26, 2007 Corsair Employees Share Posted October 26, 2007 And if you still have problems please test the modules one at a time to make sure one is not failing with http://www.memtest.org at their tested settings! Link to comment Share on other sites More sharing options...
Philippe224 Posted November 2, 2007 Author Share Posted November 2, 2007 My setting for 4X1gb and did not work ddr voltage: 1.90v Memory clock frequency: ddr 667 tcl: auto trcd: auto trp: auto tras: auto trc: auto twr: auto trrd: auto trwt: auto trtp: auto twrrd: auto trdrd: auto trfc: auto 1t/2t memory timing: auto I only have change the to first thing every else was at auto Link to comment Share on other sites More sharing options...
DerekT Posted November 2, 2007 Share Posted November 2, 2007 Try this: ddr voltage: 2.0v Memory clock frequency: ddr 667 tcl: 5 trcd: 5 trp: 5 tras: 15 trc: auto twr: auto trrd: auto trwt: auto trtp: auto twrrd: auto trdrd: auto trfc: auto 1t/2t memory timing: 2T Test with memtest. Results? Link to comment Share on other sites More sharing options...
Philippe224 Posted November 2, 2007 Author Share Posted November 2, 2007 Na it wont work !! I can not put my ddr voltage at 2.0v the max is 1.95v. Do I have something to do with the cpu setting every thing is at auto. My board is a asus M2n4-sli thanks Link to comment Share on other sites More sharing options...
Philippe224 Posted November 2, 2007 Author Share Posted November 2, 2007 Ok if I can not run my 4g of memory how can I run my 2g at 800mhz. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 2, 2007 Corsair Employees Share Posted November 2, 2007 According to that last Image they are running at 800 MHz. DDR 800 memory actually runs at 400 MHz clock speed but because its DDR (Double Data Rate) its 400 MHz x 2 = DDR800. You are not trying to run 4 modules at 667 MHz 667 X 2 = DDR1333? Link to comment Share on other sites More sharing options...
Philippe224 Posted November 2, 2007 Author Share Posted November 2, 2007 What do you mean by mhz 667X2. I have drop the memory clock frequency to 667 when I try to run my 4g and thats all... Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 2, 2007 Corsair Employees Share Posted November 2, 2007 The Frequency in CPU-Z will show the actual clock frequency not the DDR frequency. I am asking you what are the exact settings you are trying to set, and with 4 modules I would set the NB/MCH voltage +.05 Volts as well if you have the option to set that in your BIOS. Link to comment Share on other sites More sharing options...
DerekT Posted November 2, 2007 Share Posted November 2, 2007 You are not trying to run 4 modules at 667 MHz 667 X 2 = DDR1333? Do you mean that for this board and with four DRAM banks populated with 800Mhz DRAM, the settings should be: Try this: ddr voltage: 2.0v Memory clock frequency: ddr 333 tcl: 5 trcd: 5 trp: 5 tras: 15 trc: auto twr: auto trrd: auto trwt: auto trtp: auto twrrd: auto trdrd: auto trfc: auto 1t/2t memory timing: 2T Link to comment Share on other sites More sharing options...
Philippe224 Posted November 3, 2007 Author Share Posted November 3, 2007 I my bios I can not go higher than 1.95v for the ddr and the lower for the fequency is 400ddr. So lets juste say that I am a newbie and I don't not what to do more. Every thing that a test didn't work so I will run at 2g at 800mhz and sell my order to pair. Maybe the bios is to old but my board is not very good for overclocking to... Link to comment Share on other sites More sharing options...
DerekT Posted November 3, 2007 Share Posted November 3, 2007 so I will run at 2g at 800mhz and sell my order to pair. Maybe the bios is to old but my board is not very good for overclocking to... I think that is your best route as well. I still run with 2GB and I have a very new system. It is only specialized work that will really find a benefit with greater than 2GB anyway. Since you can only make it to 400Mhz and higher, the I was correct in my first settings of 667. This is the QDR (Quad Data Rate) and 800 is next. If setting to 667 does not work, then you are going the correct route. Link to comment Share on other sites More sharing options...
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