ASUS ROG Maximus Z790 Hero with 128GB DDR5 RAM

[Hurtzrus]

I’m think I will give up. I have managed to stabilise the system setting the RAM to 5200 with XMP 1. 

This is my system but I still get errors in memtest86 even reducing to 5200. The bios is the latest version.

does anyone have a fix or get around for the this to assist in removing the errors and increase memory to 5600 or do I just go back to 2 x 32gb at 5600MHz

• Corsair Dominator Platinum RGB 64GB (4x32GB) 5600MHz DDR5
• Asus ROG Maximus Z790 Hero (LGA 1700) DDR5 ATX Motherboard
• Intel Core i9 Raptor 13900KS 3.2GHz Twenty Four Core LGA1700 CPU Base: 3.2GHz, Turbo: 6.0GHz
• NZXT Kraken Elite 360  Black with RGB fans AIO Cooler - RL-KR36E-B1
• ASUS NVIDIA GeForce RTX 4090 ROG Strix OC 24GB GDDR6X Ray-Tracing Graphics Card, 16384 Core, 2640MHz Boost DLSS 3
• 3 X WD_BLACK SN850X 2TB M.2 2280 PCIe Gen4 NVMe Gaming SSD 2 with Heatsink up to 7300 MB/s
• 1650W Thermaltake Toughpower GF3, Native PCIe 5, Fully Modular, 80 PLUS Gold, Single Rail, 137.5A, 140mm Fan, ATX3.0 PSU 7P0CI

[Silent_Scone]

Hi @Hurtzrus 

It would seem given your comment regarding "going back to" that you may be combining memory kits, which isn't supported by memory or board vendors. Regardless, 128GB is a lot of memory, and any form of OC beyond JEDEC with this density will be tough for some memory controllers. If you are stable at 5200MT, I would take that as a win in this configuration.

See here for more information on XMP/EXPO

[Hurtzrus]

No I haven’t combined the DDR they are exactly the same and all 5600MHz. I wanted 128GB for 4K video editing but didn’t think the motherboard on the latest bios and a I9 13900k raptor there would be an issue but reading all the reviews on it the Z790 hero motherboard is the issue. 

[Silent_Scone]

Which kit, can you specify the part number?

[Hurtzrus]

It’s all working and stable with XMP1 at 5200 but won’t goto 5600 I get code 55 on the motherboard. I made some tweaks for this to work but only minor ones 

1. VDD Voltage to 1.30

2. VDDQ Voltage to 1.30 

3. PMIC voltages to by per PMIC 

4. Reduce RAM MHz to 5200

Pictures attached and box of Corsair Dominator DDR5 platinum with serials. 

 

 

 

 

 

[Silent_Scone · Accepted solution]

You're combining memory kits. I'd implore you to read the post I linked in the previous post.

Memory kits are binned by the vendors in the density they are sold in, once you add more memory (whether that be from a kit with the same part number or otherwise), the specified timings, frequency and voltage are no longer valid. The fact you are at least somewhat stable at 5200MT is reasonable.

[Hurtzrus]

Ok thanks for your help. Would you advise to go to 4800 mhz or if stable ok to leave it at 5200 as long as no stability issues? 

[Silent_Scone]

If the system is stable, there's no harm in staying at 5200MT. You've been quite lucky that simply reducing the frequency was sufficient enough without tuning timings and voltage.