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Old ASUS P9X79 Pro is still alive - now with ReBAR!

Marcinprv
Level 10

I recently added the latest NVMe driver (NvmExpressDxe_5.ffs) and ReBAR support (ReBarDxe.ffs) to my old ASUS P9X79 Pro.
After activating ReBAR (256MB -> 16GB) I have a 3.5% performance increase in Cyberpunk 2077 v2.2 on my RTX 4070 Ti.

Marcinprv_0-1736561625712.png

How to activate ReBAR:

  1. Download and flash my modded BIOS: P9X79PRO (ReBAR).zip
  2. Disable CSM in the BIOS.
  3. Run this program in Windows to activate ReBAR: ReBarState.exe
  4. Set the value to: 32
  5. Reboot your system and check the ReBAR status in GPU-Z app

    Marcinprv_1-1736561719053.png

Benchmark 4K Ray-Tracing Ultra settings:

ReBAR Disabled:
Average FPS 92.35 / Min FPS 84.97 / Max FPS 100.60
DNIaCLG

ReBAR Enabled:
Average FPS 95.65 / Min FPS 88.57 / Max FPS 104.09
SRtUObI

I think the performance is pretty good for a 13 year old platform.


What next with my X79 platform?

2023
 (RTX 3070) - 3DMark Speed Way (score 3854)
2024
 (RTX 4070 Ti) - 3DMark Speed Way (score 6097) +37%
2025 (RTX 50xx) - 3DMark Speed Way (score 🤣)

My overclocked 13-year-old platform has a result 10% better than the (new) computer with the same GPU tested by VideoCardz.com
I have no idea what specs they used, but probably top-of-the-line.

YyLkUZs

MB: ASUS P9X79 Pro (NVMe & ReBAR Mod)
CPU: Intel Xeon E5-1680 V2 @ 4.4GHz (1.36V)
Cooler: Liquid Freezer II 280
RAM: 32GB (4x8GB) Corsair Vengeance Quad-DDR3 2400MHz CL10
PSU: Cooler Master Silent Pro M2 1500W
GFX: ASUS GeForce RTX 4070 Ti OC @ 3000/12250MHz
SSD: Samsung SSD 990 Pro 4TB
SSD: Samsung 870 QVO 8TB
HDD: Seagate ST18000NM000J-2TS 18TB
Monitor: ASUS ROG Swift OLED PG48UQ
Logitech: G900 , G915, G27, Z906, G51, Brio, other...
299 Views
9 REPLIES 9

Antraxtacide
Level 9

Thanks!! 😀

You have inspired me to unbox my old P9X79 LE from the memories.    What would be a good use for a 13 year old X79 System ??

20250111_113748[1].jpg

 

i9 10900X ~X299~ 32GB
https://valid.x86.fr/4wzdj3

4834MHz ~ 1.25v ~ 10C\20T
3323MHz ~ 1.30v ~ 19mb L3
3800MTz ~1.55v~ 14.14.14.18

"What would be a good use for a 13 year old X79 System ??"

If you have a powerful GPU, a fast SSD, Quad DDR3-2400 and an 8-core processor overclocked to at least 4.3GHz, such a system will be suitable for almost everything. Apart from games that require the AVX2 instruction set, such as Alan Wake 2 or Indiana Jones and the Great Circle. Photoshop CC 2025 too (requires AVX2, but that's a lie) it turned out that they only blocked Non-AVX2 CPUs in the installer, once you install it, it works without a problem on a CPU with AVX. On the other hand DaVinci Resolve runs well on this system with an RTX 4070 Ti - encoding at 90FPS for a 4K60 project.

Of course, Windows 11 requires TPM 2.0 so you will need to create a Windows installer using Rufus tool, and if you want to use the Canary Insider channel (like me) you should use this script.

mN2MAQ7

"Thank you" Adobe!

Oh wait... I can still run Alan Wake 2 in 4K and Ray-Tracing, but I have to emulate the CPU.


"Thank you" Remedy!

Marcinprv_0-1736625952463.jpeg

MB: ASUS P9X79 Pro (NVMe & ReBAR Mod)
CPU: Intel Xeon E5-1680 V2 @ 4.4GHz (1.36V)
Cooler: Liquid Freezer II 280
RAM: 32GB (4x8GB) Corsair Vengeance Quad-DDR3 2400MHz CL10
PSU: Cooler Master Silent Pro M2 1500W
GFX: ASUS GeForce RTX 4070 Ti OC @ 3000/12250MHz
SSD: Samsung SSD 990 Pro 4TB
SSD: Samsung 870 QVO 8TB
HDD: Seagate ST18000NM000J-2TS 18TB
Monitor: ASUS ROG Swift OLED PG48UQ
Logitech: G900 , G915, G27, Z906, G51, Brio, other...

wladimirisnard
Level 8

Hello, good afternoon. I am trying to update the BIOS that you provided. I put it on a FAT32 USB drive, with only the file named: P9X79PRO.cap, and inserted it into the USB port designated for BIOS updates. I held the button for 3 seconds and then released it. I waited for a while, but nothing happened. Can you help me?

Hi, I have the same problem with my motherboard - USB Flashback doesn't work.
This may be related to the fact that the BIOS is modified and ASUS (maybe) checks the originality of the CAP files.
To solve this problem I bought a few identical blank EPPROM chips and programmed them using a cheap USB programmer.

All you need is: 

  1. Cheap CH341A Programmer from Amazon (£8.99)
  2. Spare 25Q64BVAIG EPPROM from eBay (£5.21)
  3. (Optional) Chip Extractor remover tools from eBay (£5.94)
  4. Software to program your EPPROM chip - Download
  5. Install CH341A Programmer Windows driver (installer inside program archive)

H30dTeo

Place blank EPPROM chip in the right direction (with the notch on chip corresponding to the white dot on the image in programmer app), connect the programmer, select the appropriate chip (25Q64BV), open the CAP file and write it to the EPPROM chip.

DO NOT use the original EPPROM chip, because if something goes wrong and you brick your motherboard, you can always turn off the computer, replace the EPPROM chip with the original one and everything will start working.

GOOD LUCK!

After thinking about it, I could start selling a kit with a modified EPPROM + Chip Extractor tool.
All you need to do is pull out the old chip and swap it in for a new one. Of course, the system should support UEFI (not be installed in CSM mode). Otherwise you would have to convert the disk from MBR -> GPT, or reinstall the system in GPT mode.

To check it:

  1. Open Disk Management
  2. Right-click on system drive (for example Disk 0)
  3. Then Properties
  4. Go to Volumes tap
  5. Partition style must be GPT!

Marcinprv_0-1738249618506.png

 

MB: ASUS P9X79 Pro (NVMe & ReBAR Mod)
CPU: Intel Xeon E5-1680 V2 @ 4.4GHz (1.36V)
Cooler: Liquid Freezer II 280
RAM: 32GB (4x8GB) Corsair Vengeance Quad-DDR3 2400MHz CL10
PSU: Cooler Master Silent Pro M2 1500W
GFX: ASUS GeForce RTX 4070 Ti OC @ 3000/12250MHz
SSD: Samsung SSD 990 Pro 4TB
SSD: Samsung 870 QVO 8TB
HDD: Seagate ST18000NM000J-2TS 18TB
Monitor: ASUS ROG Swift OLED PG48UQ
Logitech: G900 , G915, G27, Z906, G51, Brio, other...

wladimirisnard
Level 8

It seems safer to do it this way :), I'll see if I do as you suggested. I have another question, which NVME card did you buy to put on this motherboard, I already have the NVME SSD, but I need to adapt it. The idea is to use it for the operating system. Is it worth it?

If you're talking about a PCIe to M.2 NVMe adapter, then that's irrelevant - it's just an adapter with traces and no chips.

You can buy an ASUS Hyper M.2 x4 Mini on eBay for £20 - I'm using this one.
...or any other cheap (noname) one on eBay for £8

MB: ASUS P9X79 Pro (NVMe & ReBAR Mod)
CPU: Intel Xeon E5-1680 V2 @ 4.4GHz (1.36V)
Cooler: Liquid Freezer II 280
RAM: 32GB (4x8GB) Corsair Vengeance Quad-DDR3 2400MHz CL10
PSU: Cooler Master Silent Pro M2 1500W
GFX: ASUS GeForce RTX 4070 Ti OC @ 3000/12250MHz
SSD: Samsung SSD 990 Pro 4TB
SSD: Samsung 870 QVO 8TB
HDD: Seagate ST18000NM000J-2TS 18TB
Monitor: ASUS ROG Swift OLED PG48UQ
Logitech: G900 , G915, G27, Z906, G51, Brio, other...

Marcinprv
Level 10

Another improvement with DLLS 4 (+3.0%)
Average FPS 98.62 / Min FPS 89.62 / Max FPS 106.54 

eaMsmUx


Something Extra:
GeForce Game Ready Driver 572.16 | Windows 11 (805MB)
NVIDIA App 11.0.2.312 | Windows 10/11 (147MB)

MB: ASUS P9X79 Pro (NVMe & ReBAR Mod)
CPU: Intel Xeon E5-1680 V2 @ 4.4GHz (1.36V)
Cooler: Liquid Freezer II 280
RAM: 32GB (4x8GB) Corsair Vengeance Quad-DDR3 2400MHz CL10
PSU: Cooler Master Silent Pro M2 1500W
GFX: ASUS GeForce RTX 4070 Ti OC @ 3000/12250MHz
SSD: Samsung SSD 990 Pro 4TB
SSD: Samsung 870 QVO 8TB
HDD: Seagate ST18000NM000J-2TS 18TB
Monitor: ASUS ROG Swift OLED PG48UQ
Logitech: G900 , G915, G27, Z906, G51, Brio, other...

wladimirisnard
Level 8

Thanks for the tips and help. When the kit I bought to change the bios arrives I'll post the result here :=)

Good luck!
Out of curiosity, what GPU are you planning to use?

MB: ASUS P9X79 Pro (NVMe & ReBAR Mod)
CPU: Intel Xeon E5-1680 V2 @ 4.4GHz (1.36V)
Cooler: Liquid Freezer II 280
RAM: 32GB (4x8GB) Corsair Vengeance Quad-DDR3 2400MHz CL10
PSU: Cooler Master Silent Pro M2 1500W
GFX: ASUS GeForce RTX 4070 Ti OC @ 3000/12250MHz
SSD: Samsung SSD 990 Pro 4TB
SSD: Samsung 870 QVO 8TB
HDD: Seagate ST18000NM000J-2TS 18TB
Monitor: ASUS ROG Swift OLED PG48UQ
Logitech: G900 , G915, G27, Z906, G51, Brio, other...