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Memory not operating at top speed?

post #1 of 5
Thread Starter 
I put together this motherboard/cpu/ram combo a few months ago and just noticing now the ram box shows it is supposed to be 1866 Mhz. My computer shows the memory to be operating at 1600Mhz. What could be the potential cause of this? I followed the motherboard manual and have the memory in the corresponding channel slots and it shows the motherboard allows1866 Mhz memory.
Budget Setup
(15 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-4170 Asus M5a97 R2.0 PowerColor HD 7870 PCS Tahiti LE 8GB Patriot Viper DDR3 1600 Mhz  
Hard DriveHard DriveOptical DriveOS
Western Digital Caviar Green 7200RPM 1TB Western Digital 500 GB 7200 RPM  2x LG GH22NS30 (SATA) 22x DVD +/- RW Dual Layer Windows 7 64-Bit 
MonitorKeyboardPowerCase
Asus VH242H Razer Tarantula Thermaltake TR2 600W Antec 1200 
MouseMouse PadAudio
Razer Deathadder Razer Exact-Mat Asus Xonar DG 
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Budget Setup
(15 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-4170 Asus M5a97 R2.0 PowerColor HD 7870 PCS Tahiti LE 8GB Patriot Viper DDR3 1600 Mhz  
Hard DriveHard DriveOptical DriveOS
Western Digital Caviar Green 7200RPM 1TB Western Digital 500 GB 7200 RPM  2x LG GH22NS30 (SATA) 22x DVD +/- RW Dual Layer Windows 7 64-Bit 
MonitorKeyboardPowerCase
Asus VH242H Razer Tarantula Thermaltake TR2 600W Antec 1200 
MouseMouse PadAudio
Razer Deathadder Razer Exact-Mat Asus Xonar DG 
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Reply
post #2 of 5
Go into your BIOS and make sure you set your speed at 1866Mhz. At times by default its either set on AUTO or some lower frequency.
My System
(24 items)
 
   
CPUMotherboardGraphicsRAM
i5-3750k Asrock P67 Extreme 4 Gen 3 B3 eVGA GTX 680 Crucial Tracer 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 SSD Western Digital Black Caviar ASUS XSPC Raystorm 
CoolingCoolingCoolingCooling
XSPC EX360 XSPC GTX680 Cooling block Liang D5 Alphacool Aqualis PRO w/ Nano Coat 
CoolingCoolingOSOS
XSPC Dual 5.25" Bay Reservoir - Laing D5 / MCP655 Monsoon Fittings Windows 7 Professional 64-bit Window 8 Pro 
MonitorKeyboardPowerCase
Samsung S27A950D Black Widow Ultimate BF3 Edition XFX Platinum 1000w Corsair 800D 
MouseMouse PadAudioOther
Logitech g9x Corepad Logitech G930  LOGISYS Computer ML12UV 12" 18 LED Super Bright... 
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My System
(24 items)
 
   
CPUMotherboardGraphicsRAM
i5-3750k Asrock P67 Extreme 4 Gen 3 B3 eVGA GTX 680 Crucial Tracer 
Hard DriveHard DriveOptical DriveCooling
Samsung 830 SSD Western Digital Black Caviar ASUS XSPC Raystorm 
CoolingCoolingCoolingCooling
XSPC EX360 XSPC GTX680 Cooling block Liang D5 Alphacool Aqualis PRO w/ Nano Coat 
CoolingCoolingOSOS
XSPC Dual 5.25" Bay Reservoir - Laing D5 / MCP655 Monsoon Fittings Windows 7 Professional 64-bit Window 8 Pro 
MonitorKeyboardPowerCase
Samsung S27A950D Black Widow Ultimate BF3 Edition XFX Platinum 1000w Corsair 800D 
MouseMouse PadAudioOther
Logitech g9x Corepad Logitech G930  LOGISYS Computer ML12UV 12" 18 LED Super Bright... 
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Reply
post #3 of 5
Thread Starter 
Well ok then. It was set to auto in the BIOS. So I changed it to manual DDR3 1866 Mhz and started the computer again but my browser firefox doesn't work. It just opens and crashes immediately every time i try to open it. Went back into the BIOS and changed the ram to Auto and it works fine again.

What the hell.....
Budget Setup
(15 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-4170 Asus M5a97 R2.0 PowerColor HD 7870 PCS Tahiti LE 8GB Patriot Viper DDR3 1600 Mhz  
Hard DriveHard DriveOptical DriveOS
Western Digital Caviar Green 7200RPM 1TB Western Digital 500 GB 7200 RPM  2x LG GH22NS30 (SATA) 22x DVD +/- RW Dual Layer Windows 7 64-Bit 
MonitorKeyboardPowerCase
Asus VH242H Razer Tarantula Thermaltake TR2 600W Antec 1200 
MouseMouse PadAudio
Razer Deathadder Razer Exact-Mat Asus Xonar DG 
  hide details  
Reply
Budget Setup
(15 items)
 
  
CPUMotherboardGraphicsRAM
AMD FX-4170 Asus M5a97 R2.0 PowerColor HD 7870 PCS Tahiti LE 8GB Patriot Viper DDR3 1600 Mhz  
Hard DriveHard DriveOptical DriveOS
Western Digital Caviar Green 7200RPM 1TB Western Digital 500 GB 7200 RPM  2x LG GH22NS30 (SATA) 22x DVD +/- RW Dual Layer Windows 7 64-Bit 
MonitorKeyboardPowerCase
Asus VH242H Razer Tarantula Thermaltake TR2 600W Antec 1200 
MouseMouse PadAudio
Razer Deathadder Razer Exact-Mat Asus Xonar DG 
  hide details  
Reply
post #4 of 5
Quote:
Originally Posted by Viperelite View Post

I put together this motherboard/cpu/ram combo a few months ago and just noticing now the ram box shows it is supposed to be 1866 Mhz. My computer shows the memory to be operating at 1600Mhz. What could be the potential cause of this?
The BIOS defaulting to SPD's JEDEC timings rather than the faster but less strict 1866 MHz XMP timings. Very likely even those JEDEC timings are optimistic
post #5 of 5
The XMP profile has a lot more timings to it than just those four numbers and voltage and speed that's usually mentioned when talking about RAM timings. All those secondary timings can be important.

If you want to set everything manually, there's programs that can show you the XMP profile of your memory sticks. The software "Thaiphoon Burner" has a free demo version that can read it out of the memory sticks.
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