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Setting a memory to run at 1600Mhz

post #1 of 5
Thread Starter 
Hi, I recently build myself a PC with AMD A8 3850 APU on a Gigabyte GA-A75M-S2V motherboard (specs) and two Kingston 2GB 1600MHz DDR3 Non-ECC CL9 DIMM HyperX Blu memory modules (datasheet).

Now, the memory defaults at 1333Mhz and 1.5v but I want it at 1600Mhz and 1.65v as it should be. Both the APU and the motherboard are supposed to support memory up to 1866Mhz. What confuses me is this line "2 x 1.5V DDR3 DIMM sockets supporting up to 32 GB of system memory" from the motherboard specs.

According to the memory datasheet "this module has been tested to run at DDR3-1600MHz at a low latency timing of 9-9-9-27 at 1.65V". So can I safely set it to that in the BIOS without hurting the motherboard or processor?

Also in the BIOS there are other settings that are not specified in the memory datasheet. Here are some screens:



What should I set those values to? Also if I change the DDR3 memory voltage (presuming that the motherboard support the 1.65v needed for the memory to run at 1600Mhz) should I change some other voltages too or clock the processor as I read somewhere else?

I tried changing the memory clock only, setting it at x8.00 (1600Mhz) and leaving all else at [Auto] but then the memory was read as 2GB (1.5 + 0.5 as the 0.5 are reserved for the integrated GPU) instead of 4GB (3.5 + 0.5) in the POST screen. Windows reported 3GB of memory.

And at last, how do I check if the memory is running in dual channel mode? The POST screen does not say anything except the size and mhz of the memory and in apps such as CPU-Z and some others I tried that field is grayed out.
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Jupiter V
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Pluto
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CPUMotherboardGraphicsRAM
Intel® Core™ i7-5820K ASUS X99-S NVIDIA GeForce® GTX 1080 Founders Edition Kingston HyperX® Predator 16GB DDR4-2400 CL12 
Hard DriveHard DriveHard DriveOptical Drive
Samsung SM951 NVMe 256GB Samsung SSD 840 PRO 256GB WD Purple™ WD20PURX RAID 0 4TB Sony Optiarc AD-5200S 
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PowerCaseMouseMouse Pad
Antec® HCP-1000 Platinum Corsair Carbide Series® Air 540 ASUS ROG Gladius ASUS ROG GM50 
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Sennheiser HD 449 Creative A250 Xbox One Wireless Controller Logitech® MOMO® Racing 
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post #2 of 5
Ignore the line that you noticed. 1.65V is absolutely fine on this integrated memory controller. I know people who have safely taken 1.8V DDR3 to the limits on APU platform. You will see a good performance boost at 1600Mhz, vs 1333Mhz, at the same timings.
post #3 of 5
Thread Starter 
Well, I set the memory at 1600Mhz and 1.65V with the following timings:

1T/2T Command Timing [1T]
CAS# latency [9T]
RAS to CAS R/W Delay [9T]
Row Precharge Time [9T]
Minimum RAS Active Time [27T]
TwTr Command Delay [5T]
Trfc0 for DIMM2 [110ns]
Trfc1 for DIMM1 [110ns]
Write Recovery Time [10T]
Precharge Time [5T]
Row Cycle Time [33]
RAS to RAS Delay [4T]
Four Bank Activate Window [20T]

Basically, I left all at default as with the memory set at 1333Mhz and 1.5V except for the "1T/2T Command Timing" at [1T] instead of [2T] and the "Minimum RAS Active Time" at [27T] instead of [24T].

Everything looks fine for now, so should I leave it at this?
Jupiter V
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Pluto
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CPUMotherboardGraphicsRAM
Intel® Core™ i7-5820K ASUS X99-S NVIDIA GeForce® GTX 1080 Founders Edition Kingston HyperX® Predator 16GB DDR4-2400 CL12 
Hard DriveHard DriveHard DriveOptical Drive
Samsung SM951 NVMe 256GB Samsung SSD 840 PRO 256GB WD Purple™ WD20PURX RAID 0 4TB Sony Optiarc AD-5200S 
CoolingOSMonitorKeyboard
Corsair Hydro Series™ H105 Microsoft Windows® 10 Pro ASUS ROG SWIFT PG278Q CM Storm QuikFire TK 
PowerCaseMouseMouse Pad
Antec® HCP-1000 Platinum Corsair Carbide Series® Air 540 ASUS ROG Gladius ASUS ROG GM50 
AudioAudioOtherOther
Sennheiser HD 449 Creative A250 Xbox One Wireless Controller Logitech® MOMO® Racing 
CPUMotherboardRAMHard Drive
AMD A8-3850 GIGABYTE GA-A75M-S2V Kingston HyperX Blu 4GB WD Blue 320GB 
Hard DriveCoolingOSMonitor
WD Green 1TB Cooler Master GeminII Windows 10 Pro BenQ EW2740L 
KeyboardPowerCaseMouse
A4TECH Game Master Keyboard KB-28G Thermaltake TR2 450W Cooler Master N200 A4TECH V-Laser Gaming Mouse F7 
Mouse PadAudioOther
A4TECH X7 Gaming Labtec Pulse 285 Logitech Rumble Gamepad F510 
CPUGraphicsRAMHard Drive
Intel® Atom™ Z3745 Intel® HD Graphics 2GB LPDDR3 32GB EMMC 
OSMonitorPowerAudio
Windows 10 Home 8" Full HD (1920 x 1200) IPS display Li-ion 6400 mAh battery Dolby® Audio 
Other
WiFi 802.11 a/b/g/n, MiMo, Bluetooth® 4.0 
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Jupiter V
(20 items)
 
Pluto
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CPUMotherboardGraphicsRAM
Intel® Core™ i7-5820K ASUS X99-S NVIDIA GeForce® GTX 1080 Founders Edition Kingston HyperX® Predator 16GB DDR4-2400 CL12 
Hard DriveHard DriveHard DriveOptical Drive
Samsung SM951 NVMe 256GB Samsung SSD 840 PRO 256GB WD Purple™ WD20PURX RAID 0 4TB Sony Optiarc AD-5200S 
CoolingOSMonitorKeyboard
Corsair Hydro Series™ H105 Microsoft Windows® 10 Pro ASUS ROG SWIFT PG278Q CM Storm QuikFire TK 
PowerCaseMouseMouse Pad
Antec® HCP-1000 Platinum Corsair Carbide Series® Air 540 ASUS ROG Gladius ASUS ROG GM50 
AudioAudioOtherOther
Sennheiser HD 449 Creative A250 Xbox One Wireless Controller Logitech® MOMO® Racing 
CPUMotherboardRAMHard Drive
AMD A8-3850 GIGABYTE GA-A75M-S2V Kingston HyperX Blu 4GB WD Blue 320GB 
Hard DriveCoolingOSMonitor
WD Green 1TB Cooler Master GeminII Windows 10 Pro BenQ EW2740L 
KeyboardPowerCaseMouse
A4TECH Game Master Keyboard KB-28G Thermaltake TR2 450W Cooler Master N200 A4TECH V-Laser Gaming Mouse F7 
Mouse PadAudioOther
A4TECH X7 Gaming Labtec Pulse 285 Logitech Rumble Gamepad F510 
CPUGraphicsRAMHard Drive
Intel® Atom™ Z3745 Intel® HD Graphics 2GB LPDDR3 32GB EMMC 
OSMonitorPowerAudio
Windows 10 Home 8" Full HD (1920 x 1200) IPS display Li-ion 6400 mAh battery Dolby® Audio 
Other
WiFi 802.11 a/b/g/n, MiMo, Bluetooth® 4.0 
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post #4 of 5
Sounds good; good luck
post #5 of 5
Now try tightening timings back down until you are unstable (be prepared for some CMOS resets), maybe 8-9-8-24 1T, 7-9-7-24 1T, 7-8-7, 6-9-6, 6-8-6, ect...
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Light Gamer #1
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i3-6100 ASRock Fatal1ty Z170 Gaming K4/D3 MSI r7850 TFIII OC MSI r7850 TFIII OC 
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G,Skill TridentX OCZ Vector 150 TPC-612 Windows 10 
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CPUMotherboardGraphicsRAM
Athlon 860K MSI A88X-G45 MSI GTX 460 G.Skill RipjawsZ 
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