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Taking RAM from 2133 to 1866 for A8-3870k

post #1 of 5
Thread Starter 
Just put together a PC using 2133 RAM. Pretty sure I saw my computer read the ram was actually 1600 or lower. How can I manually set it to register and function at 1866 (the highest supported on my P75-somethingsomethinesomething.)
    
CPUMotherboardGraphicsRAM
i5 2500k ASUS P8P67 NVidia 560 RipjawsX 8GB (2 x 4GB) 1866MHz 
Hard Drive
SSD/HDD 
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CPUMotherboardGraphicsRAM
i5 2500k ASUS P8P67 NVidia 560 RipjawsX 8GB (2 x 4GB) 1866MHz 
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SSD/HDD 
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post #2 of 5
all you should need to change is the memory / FSB divider(aka multiple).

1866 needs a 9.33 multiplier for instance. (based on a 200 mhz ht clock aka fsb)
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Alien Invasion
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OC'in beast
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StoreMaster9000
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CPUMotherboardGraphicsRAM
AMD Threadripper 1950x Alienware Area-51 TR edition Radeon Pro Duo (aka R9 Fury x2) HyperX 32GB DDR4-2400 
Hard DriveHard DriveOSMonitor
Intel 600p NVME Samsung NVME Windows 10 RS3 Dell P4317Q 
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Cooler Master QuickFire Cherry Brown Dell 1500W Alienware Area-51 Logitech MX5500 
CPUMotherboardGraphicsGraphics
AMD FX-8350 (Vishera) Gigabyte GA-990XA AMD 285X (unreleased) AMD 285X (unreleased) 
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Mushkin Enhanced Blackline 8GB (996679) Western Digital WD10EALS 1TB Blue Corsair Force Series GT CSSD-F180GBGT-BK 180GB Intel 530 Series SSDSC2BW240A401 240GB 
Optical DriveCoolingCoolingCooling
Sony 20X Sata DVD-RW Scythe Mugen 2 rev B (3) Scythe Slip Stream SY1225SL12H-P Antec Tri-Cool 140mm 
CoolingCoolingOSMonitor
Antec Tri-Cool 120mm Scythe Ultra Kaze DFS123812-3000 Windows 7 Pro 64bit ASUS PA248Q 24.1" IPS 
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Coolermaster Storm QuickFire Stealth Cherry MX ... Antec Earthwatts EA-750 Antec 300 Logitech G5 
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Steel Series Starcraft 2 Marine 
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Opteron 6386 SE TYAN S8236-IL el crappo onboard vga 48GB RDDR3-1600 ECC 
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Seagate IronWolf Intel 200G DC S3710 SATA SSD Seagate Pulsar.2 ST200FM0002 SAS SSD VMWare Esxi 6.0 + Freenas 9.10 
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post #3 of 5
Thread Starter 
How would one go about that?
    
CPUMotherboardGraphicsRAM
i5 2500k ASUS P8P67 NVidia 560 RipjawsX 8GB (2 x 4GB) 1866MHz 
Hard Drive
SSD/HDD 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i5 2500k ASUS P8P67 NVidia 560 RipjawsX 8GB (2 x 4GB) 1866MHz 
Hard Drive
SSD/HDD 
  hide details  
Reply
post #4 of 5
Thread Starter 
CPU-Z says my DRAM speed is 800?

Max Bandwidth PC3-`1800 (800MHz)

I'm running a Ripjaw 2x4GB 2133 set. DOn't know the timings. Is this all adding up or is my MOBO confused.
    
CPUMotherboardGraphicsRAM
i5 2500k ASUS P8P67 NVidia 560 RipjawsX 8GB (2 x 4GB) 1866MHz 
Hard Drive
SSD/HDD 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i5 2500k ASUS P8P67 NVidia 560 RipjawsX 8GB (2 x 4GB) 1866MHz 
Hard Drive
SSD/HDD 
  hide details  
Reply
post #5 of 5
look for the manual for ASUS P8P67 on the asus support and downloads website.

It should have a section in the manual just for the BIOS. At least on my motherboard, adjusting the multiplier automatically adjusts the SPD (timings) of my ram. What is the model number of your ram?? I would be content at 1600 mhz at a lower timing then 1866 at a higher timing IMO.

Your DRAM speed * 2 (DualDataRate) = 1600 which actually may be the highest supported ram on that CPU. PC3-12800 / 8bits = DDR3 1600MHz

ps: in cpuz the page with the DRAM speed also has CAS# (which is the main number in your timings).
Alien Invasion
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StoreMaster9000
(11 items)
 
CPUMotherboardGraphicsRAM
AMD Threadripper 1950x Alienware Area-51 TR edition Radeon Pro Duo (aka R9 Fury x2) HyperX 32GB DDR4-2400 
Hard DriveHard DriveOSMonitor
Intel 600p NVME Samsung NVME Windows 10 RS3 Dell P4317Q 
KeyboardPowerCaseMouse
Cooler Master QuickFire Cherry Brown Dell 1500W Alienware Area-51 Logitech MX5500 
CPUMotherboardGraphicsGraphics
AMD FX-8350 (Vishera) Gigabyte GA-990XA AMD 285X (unreleased) AMD 285X (unreleased) 
RAMHard DriveHard DriveHard Drive
Mushkin Enhanced Blackline 8GB (996679) Western Digital WD10EALS 1TB Blue Corsair Force Series GT CSSD-F180GBGT-BK 180GB Intel 530 Series SSDSC2BW240A401 240GB 
Optical DriveCoolingCoolingCooling
Sony 20X Sata DVD-RW Scythe Mugen 2 rev B (3) Scythe Slip Stream SY1225SL12H-P Antec Tri-Cool 140mm 
CoolingCoolingOSMonitor
Antec Tri-Cool 120mm Scythe Ultra Kaze DFS123812-3000 Windows 7 Pro 64bit ASUS PA248Q 24.1" IPS 
KeyboardPowerCaseMouse
Coolermaster Storm QuickFire Stealth Cherry MX ... Antec Earthwatts EA-750 Antec 300 Logitech G5 
Mouse Pad
Steel Series Starcraft 2 Marine 
CPUMotherboardGraphicsRAM
Opteron 6386 SE TYAN S8236-IL el crappo onboard vga 48GB RDDR3-1600 ECC 
Hard DriveHard DriveHard DriveOS
Seagate IronWolf Intel 200G DC S3710 SATA SSD Seagate Pulsar.2 ST200FM0002 SAS SSD VMWare Esxi 6.0 + Freenas 9.10 
PowerCaseOther
550W 1RU Tyan Mellanox ConnectX-3 Dual 10G SFP+ 
  hide details  
Reply
Alien Invasion
(12 items)
 
OC'in beast
(21 items)
 
StoreMaster9000
(11 items)
 
CPUMotherboardGraphicsRAM
AMD Threadripper 1950x Alienware Area-51 TR edition Radeon Pro Duo (aka R9 Fury x2) HyperX 32GB DDR4-2400 
Hard DriveHard DriveOSMonitor
Intel 600p NVME Samsung NVME Windows 10 RS3 Dell P4317Q 
KeyboardPowerCaseMouse
Cooler Master QuickFire Cherry Brown Dell 1500W Alienware Area-51 Logitech MX5500 
CPUMotherboardGraphicsGraphics
AMD FX-8350 (Vishera) Gigabyte GA-990XA AMD 285X (unreleased) AMD 285X (unreleased) 
RAMHard DriveHard DriveHard Drive
Mushkin Enhanced Blackline 8GB (996679) Western Digital WD10EALS 1TB Blue Corsair Force Series GT CSSD-F180GBGT-BK 180GB Intel 530 Series SSDSC2BW240A401 240GB 
Optical DriveCoolingCoolingCooling
Sony 20X Sata DVD-RW Scythe Mugen 2 rev B (3) Scythe Slip Stream SY1225SL12H-P Antec Tri-Cool 140mm 
CoolingCoolingOSMonitor
Antec Tri-Cool 120mm Scythe Ultra Kaze DFS123812-3000 Windows 7 Pro 64bit ASUS PA248Q 24.1" IPS 
KeyboardPowerCaseMouse
Coolermaster Storm QuickFire Stealth Cherry MX ... Antec Earthwatts EA-750 Antec 300 Logitech G5 
Mouse Pad
Steel Series Starcraft 2 Marine 
CPUMotherboardGraphicsRAM
Opteron 6386 SE TYAN S8236-IL el crappo onboard vga 48GB RDDR3-1600 ECC 
Hard DriveHard DriveHard DriveOS
Seagate IronWolf Intel 200G DC S3710 SATA SSD Seagate Pulsar.2 ST200FM0002 SAS SSD VMWare Esxi 6.0 + Freenas 9.10 
PowerCaseOther
550W 1RU Tyan Mellanox ConnectX-3 Dual 10G SFP+ 
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