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SDRAM Command Rate (CR) - Can't boot with 4 DIMMs set at 1T

post #1 of 2
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I have a 16GB quad channel memory kit from Avexir (4GB x 4 DDR3 2400C10 1.65V MSI Z77 MPOWER 10-12-12-31). I do not have any problem with using all four DIMMs set at command rate 2T, but if I set CR to 1T, I can not boot into the BIOS even if I lower the speed to 1600.

I don't have this problem if only install two DIMMs. With two DIMMs installed I can run at 1T even up to 2600 MHz. Am I doing something wrong? Should I even be concerned about 1T vs 2T? I did not notice much of a difference when I ran SuperPI or the AIDA64 benchmark.
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Intel Core i7 3770K  Z77 MPower (MS-7751) MSI R7950 Twin Frozr 3GD5/OC Intel(R) HD Graphics 4000 
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Avexir MSI Z77 MPOWER Optimized DDR3 2400 OCZ Vertex 4 VTX4-25SAT3-256G 2.5" 256GB SATA I... Koolance CPU-380I Water Block XSPC EX360 Radiator  
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Smoke and Mirrors
(12 items)
 
  
CPUMotherboardGraphicsGraphics
Intel Core i7 3770K  Z77 MPower (MS-7751) MSI R7950 Twin Frozr 3GD5/OC Intel(R) HD Graphics 4000 
RAMHard DriveCoolingCooling
Avexir MSI Z77 MPOWER Optimized DDR3 2400 OCZ Vertex 4 VTX4-25SAT3-256G 2.5" 256GB SATA I... Koolance CPU-380I Water Block XSPC EX360 Radiator  
CoolingOSPowerCase
XSPC D5 Dual Bay Reservoir/Pump Combo Windows 7 Corsair AX860i NZXT Switch 810  
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post #2 of 2
For benching it would matter but if you are just gaming and what not I wouldnt really worry about it. But if you change from T2 to T1 you probably have to raise your memory controllers voltage to get it stable or the timings or too tight for running at T1 for that ram.

I have VERY limited experience with IMCs
Edited by terraprime - 1/21/13 at 8:55pm
 
Problem Solver
(15 items)
 
 
CPUMotherboardGraphicsRAM
intel Core i5 3570k 4.5ghz 1.200v - 0.000 offset  Gigabyte z77X-UP4 TH Beta Bios F11C with lastes... Sapphire 7950 3GB @ 1200/1600mhz v1.299 - Curr... GSkill 2x4gb 1333mhz 7-7-7-21 2T @ 1600 8-8-8-2... 
Hard DriveCoolingOSMonitor
Crucial M4 128GB SSD SATA 3.0 M4-CT128M4SSD1 Corsair H80i AIO liquid cooling Windows 7 Professional x64 47 inch Samsung LCD HD TV 
PowerAudio
750w PC Power single rail stock 
CPUMotherboardGraphicsRAM
C2Q Q6600 GO @ 3.2ghz 1.28 Gigabyte P35 DS3-L Pencil modded Nvidia 9800 GT 512mb 2x1gb Gskill 1066 5-5-5-15 & 2x1gb Gskill Pi 80... 
Hard DriveHard DriveOptical DriveCooling
Crucial m4 CT128M4SSD1 128GB SSD - OS Drive Samsung HD103UJ & SJ 1 Terabyte HDD LG 22x DVD burner Arctic Freezer Pro 2  
OSMonitorPowerCase
Windows 7 Pro SP1 x64 HannsG 27.5" Widescreen Red thingy 750w Single rail old raidmax from 1st build beat to death 
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Problem Solver
(15 items)
 
 
CPUMotherboardGraphicsRAM
intel Core i5 3570k 4.5ghz 1.200v - 0.000 offset  Gigabyte z77X-UP4 TH Beta Bios F11C with lastes... Sapphire 7950 3GB @ 1200/1600mhz v1.299 - Curr... GSkill 2x4gb 1333mhz 7-7-7-21 2T @ 1600 8-8-8-2... 
Hard DriveCoolingOSMonitor
Crucial M4 128GB SSD SATA 3.0 M4-CT128M4SSD1 Corsair H80i AIO liquid cooling Windows 7 Professional x64 47 inch Samsung LCD HD TV 
PowerAudio
750w PC Power single rail stock 
CPUMotherboardGraphicsRAM
C2Q Q6600 GO @ 3.2ghz 1.28 Gigabyte P35 DS3-L Pencil modded Nvidia 9800 GT 512mb 2x1gb Gskill 1066 5-5-5-15 & 2x1gb Gskill Pi 80... 
Hard DriveHard DriveOptical DriveCooling
Crucial m4 CT128M4SSD1 128GB SSD - OS Drive Samsung HD103UJ & SJ 1 Terabyte HDD LG 22x DVD burner Arctic Freezer Pro 2  
OSMonitorPowerCase
Windows 7 Pro SP1 x64 HannsG 27.5" Widescreen Red thingy 750w Single rail old raidmax from 1st build beat to death 
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Reply
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