Caesius Posted November 14, 2010 Share Posted November 14, 2010 I'm a bit confused. Yesterday I received my new PC components: -i7 950 -Rampage III Gene -CMX6GX3M3A2000C9 Once I turned my new PC on, it turned out that the memory would only run at 1866 or 2133 MHz. I immediately checked the Corsair website and it turns out this memory is for i7 8xx CPU's with socket 1156. Isn't this a dual channel socket? That seems a bit strange to me with 3x2GB memory. I'm running the memory at better latencies now due to the lower memory speed, but I want to run the memory at the speed I bought it for, at 2 GHz. Is this a motherboard thing? Should I update it? Or should I return this memory for something from this list? http://www.corsair.com/products/corei7/default.aspx Thanks in advance. Here's my memory config: Memory SPD DIMM # 1 SMBus address 0x50 Memory type DDR3 Module format UDIMM Manufacturer (ID) Corsair (7F7F9E0000000000) Size 2048 MBytes Max bandwidth PC3-10700H (667 MHz) Part number CMX6GX3M3A2000C9 Number of banks 8 Nominal Voltage 1.50 Volts EPP no XMP yes XMP revision 1.2 JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency JEDEC #1 6.0-6-6-16-23 @ 444 MHz JEDEC #2 8.0-8-8-22-30 @ 592 MHz JEDEC #3 9.0-9-9-24-34 @ 666 MHz XMP profile XMP-2000 Specification PC3-16000 Voltage level 1.650 Volts Min Cycle time 1.000 ns (1000 MHz) Min tRP 9.00 ns Min tRCD 9.00 ns Min tWR 15.00 ns Min tRAS 24.00 ns Min tRC 50.63 ns Min tRFC 110.00 ns Min tRTP 7.50 ns Min tRRD 7.50 ns Command Rate 2T XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage) XMP #1 6.0-6-6-16-34-2T @ 666 MHz (1.650 Volts) XMP #2 9.0-9-9-24-51-2T @ 1000 MHz (1.650 Volts) DIMM # 2 SMBus address 0x52 Memory type DDR3 Module format UDIMM Manufacturer (ID) Corsair (7F7F9E0000000000) Size 2048 MBytes Max bandwidth PC3-10700H (667 MHz) Part number CMX6GX3M3A2000C9 Number of banks 8 Nominal Voltage 1.50 Volts EPP no XMP yes XMP revision 1.2 JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency JEDEC #1 6.0-6-6-16-23 @ 444 MHz JEDEC #2 8.0-8-8-22-30 @ 592 MHz JEDEC #3 9.0-9-9-24-34 @ 666 MHz XMP profile XMP-2000 Specification PC3-16000 Voltage level 1.650 Volts Min Cycle time 1.000 ns (1000 MHz) Min tRP 9.00 ns Min tRCD 9.00 ns Min tWR 15.00 ns Min tRAS 24.00 ns Min tRC 50.63 ns Min tRFC 110.00 ns Min tRTP 7.50 ns Min tRRD 7.50 ns Command Rate 2T XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage) XMP #1 6.0-6-6-16-34-2T @ 666 MHz (1.650 Volts) XMP #2 9.0-9-9-24-51-2T @ 1000 MHz (1.650 Volts) DIMM # 3 SMBus address 0x54 Memory type DDR3 Module format UDIMM Manufacturer (ID) Corsair (7F7F9E0000000000) Size 2048 MBytes Max bandwidth PC3-10700H (667 MHz) Part number CMX6GX3M3A2000C9 Number of banks 8 Nominal Voltage 1.50 Volts EPP no XMP yes XMP revision 1.2 JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency JEDEC #1 6.0-6-6-16-23 @ 444 MHz JEDEC #2 8.0-8-8-22-30 @ 592 MHz JEDEC #3 9.0-9-9-24-34 @ 666 MHz XMP profile XMP-2000 Specification PC3-16000 Voltage level 1.650 Volts Min Cycle time 1.000 ns (1000 MHz) Min tRP 9.00 ns Min tRCD 9.00 ns Min tWR 15.00 ns Min tRAS 24.00 ns Min tRC 50.63 ns Min tRFC 110.00 ns Min tRTP 7.50 ns Min tRRD 7.50 ns Command Rate 2T XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage) XMP #1 6.0-6-6-16-34-2T @ 666 MHz (1.650 Volts) XMP #2 9.0-9-9-24-51-2T @ 1000 MHz (1.650 Volts) Link to comment Share on other sites More sharing options...
trackrat Posted November 14, 2010 Share Posted November 14, 2010 The RAM you bought has been tested to run stable at a frequency of 2000 MHz. You can run it at any frequency that your mobo/CPU will allow. You will need to manually set the BIOS options or select XMP profiles to run the memory overclocked beyond the default i7-950 CPU 1066 MHz. RAM frequency. The max Intel officially support frequency for your CPU is 1066 MHz. but most people are able to run higher frequncies. Link to comment Share on other sites More sharing options...
Caesius Posted November 14, 2010 Author Share Posted November 14, 2010 Ok I understand.Would I really gain any performance by increasing the frequency? The improved latencies can cancel out the loss of the lower frequencies in some cases, right? Link to comment Share on other sites More sharing options...
Wired Posted November 14, 2010 Share Posted November 14, 2010 CMX6GX3M3A2000C9 is listed under the wrong area. 3 sticks = definitely meant for LGA1366 / X58 / triple channel systems. With that high of a speed bump you'd definitely see see performance increases over the loose latency, although some applications will prefer speed over timings, and vice versa. Link to comment Share on other sites More sharing options...
trackrat Posted November 14, 2010 Share Posted November 14, 2010 Ok I understand.Would I really gain any performance by increasing the frequency? The improved latencies can cancel out the loss of the lower frequencies in some cases, right? As Wired pointed out higher frequencies/lower latencies can show some system improvement but a lot depends on the software and how it uses the RAM. As an example a series of tests that I did with 4 GB. RAM run at 1333 MHz. 11-11-11-30 2T vs. 8-8-8-24 1600 MHz. 1T, showed ~ 1% difference in the 3D Vantage benchmark. Thus I run the fastest stable frequency and lowest latencies and don't fret the intangible. Link to comment Share on other sites More sharing options...
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