cancel
Showing results for 
Search instead for 
Did you mean: 

From BIOS 1601 to 1701 produces RAM compatibility issues

kaese
Level 10
I have a RAM Kit (type 32GB HyperX FURY DDR4-2666, Quad-Kit) that can boot and run flawlessly on BIOS 1601, while in contrary BIOS 1701 fails to boot or run the same kit at 2666 MHz (even after intense tweaking).
So, RAM compatibility has decreased (at least for my case).

Now, especially because 1701 has a microcode update, I dont want to be stuck to BIOS 1601 forever!
Does anybody have some insight, onto what has changed from 1601 to 1701 regarding DDR4 control?


Note that I made the same observation with two CPUs (5820K - different batch: one Costa Rica and one Malaysia) and two identical RAM-Kits.
335 Views
18 REPLIES 18

Pleot
Level 8
I think you got it the other way round concerning eventual ram settings - eventual ram is the value the machine assumes after booting... the other value is the one should be higher to pass cold boot , if I get it right

_TRG__Kicker
Level 7
I would have to agree with a few people about the bios updates. Im still running 901. Seems like a vary old bios now but its extremely stable for me.

Avenger411
Level 10
Hey,

Eventual ram voltage is meant to help the system to pass post. When a full AC power cycle is done, warm reset is impossible so the system has to stress test. If you have problem with ram, this setting might help. After boot, eventual setting gets down to your normal ram voltage (dont leave it on auto).

Max
Cpu : Intel 5930K@4.25ghz@1.2v / Cache @4.25ghz@1.20v
Cpu Cooler : Corsair H100i
Case : Corsair 780T
Memory : G.Skills 32GB DDR4-3200mhz CAS 15-15-15-35-1T@1.370v
Motherboard : Asus Rampage V Extreme (BIOS 3504)
M2 : Samsung 950 Pro NVME 512gb (Gaming)
M2 : SSD1 : OCZ RD400A 128gb (windows)
SSD1 : Crucial MX100 512gb (data)
Gfx : EVGA Titan X w/ 980 Hybrid Cooling AiO Liquid Cooler
PSU : Antec HCP-1000W
Monitor : Asus RoG Swift

Avenger411 wrote:
Hey,

Eventual ram voltage is meant to help the system to bypass post. When a full AC power cycle is done, warm reset is impossible so the system has to stress test. If you have problem with ram, this setting might help. After boot, eventual setting gets down to your normal ram voltage (dont leave it on auto).

Max

This is the way I understood it, nevertheless behaviour seems different. I have RAM voltage set in BIOS to 1.285 V, and Eventual RAM Voltage to "auto". Once booted into OS HWinfo64 and the Asus Tool show an actual RAM voltage of 1.3V.

Pleot
Level 8
On my system, if I set eventual ram that is the value will show on OS after boot,

Avenger411
Level 10
Hey guys,

Oops i am sorry i made a mistake. Eventual dram voltage is the voltage that is applied after post. Dram voltage is the voltage that is applied before post. So one should have a higher dram voltage and a lower eventual voltage. It was the other way around my bad.

Max
Cpu : Intel 5930K@4.25ghz@1.2v / Cache @4.25ghz@1.20v
Cpu Cooler : Corsair H100i
Case : Corsair 780T
Memory : G.Skills 32GB DDR4-3200mhz CAS 15-15-15-35-1T@1.370v
Motherboard : Asus Rampage V Extreme (BIOS 3504)
M2 : Samsung 950 Pro NVME 512gb (Gaming)
M2 : SSD1 : OCZ RD400A 128gb (windows)
SSD1 : Crucial MX100 512gb (data)
Gfx : EVGA Titan X w/ 980 Hybrid Cooling AiO Liquid Cooler
PSU : Antec HCP-1000W
Monitor : Asus RoG Swift

Pleot
Level 8
In my case I found out that I needed higher dram voltage just to be able to boot, after boot I could get stable with much lower ram voltages using the eventual voltage, very good for my hard earned pc parts 🙂

Pleot wrote:
In my case I found out that I needed higher dram voltage just to be able to boot, after boot I could get stable with much lower ram voltages using the eventual voltage, very good for my hard earned pc parts 🙂


Hey,

Quite normal, post ram training is quite heavy on hardware IF you have a modest overclock and start toying around with frequency/timings.

Max
Cpu : Intel 5930K@4.25ghz@1.2v / Cache @4.25ghz@1.20v
Cpu Cooler : Corsair H100i
Case : Corsair 780T
Memory : G.Skills 32GB DDR4-3200mhz CAS 15-15-15-35-1T@1.370v
Motherboard : Asus Rampage V Extreme (BIOS 3504)
M2 : Samsung 950 Pro NVME 512gb (Gaming)
M2 : SSD1 : OCZ RD400A 128gb (windows)
SSD1 : Crucial MX100 512gb (data)
Gfx : EVGA Titan X w/ 980 Hybrid Cooling AiO Liquid Cooler
PSU : Antec HCP-1000W
Monitor : Asus RoG Swift