Question CPU failing to boot with new RAM

[Fyrmn472]

Good morning, I'm experiencing a problem after installing new RAM. It's an older custom built PC and after installing the latest version of Windows 10, I needed to upgrade the 6GB DDR3 (3x2GB) because the upgrade slowed PC down quite a bit.

After reading the specs on my MB and due to the cost of the DDR3, I ended up purchasing 3 - 8GB (2x4GB) DDR3 1600MHZ to use all DIMM slots to reach the maximum allowance of memory (24GB). This was going to be a short-term fix until my new PC is built.

Specs:
CPU: Intel Core i7-940
OS: Windows 10 (v1903 for 64-bit)
MB: EVGA X58 SLI - Screenshot of installation instructions --> DIMM Installation
Memory: Corsair CMY8GX3M2A16000C9A Vengence Pro Series 8GB (2x4GB) DDR3 1600MHZ

Problem:
After installing memory (using all DIMM slots), the motherboard loops 68, 69, F3 on the digital readout and will not reach BIOS. I began testing all memory and then tried adding each stick one at a time. Once I reach 4x4GB, the loop (68, 69, F3 begins). Once I remove the 4th stick (same as old configuration), the PC boots fine showing 12GB of memory installed.

Do I need to change anything in the BIOS prior to using more DIMM slots than previously used? I appreciate anyone willing to offer some assistance. Thanks!

 

[cin19]

According to Corsair site, the Vengeance Pro Series do not support the X58 MB, you need to buy other series RAM, like XMS3, or DOMINATOR.

Memory finder: https://www.corsair.com/us/en/memoryfinder?type=motherboard&slug=ASRock-G41M-S3

 

[Fyrmn472]

Thanks for that link! If the memory doesn't support MB, is it common for it to work (up to a point)? Like I said, the memory works great up to 3 DIMM slots being use (12GB). I shouldn't be complaining because it doubles the memory I had and the speed has improved dramatically. Thanks for the response!

 

[cin19]

If the memory doesn't support MB, is it common for it to work (up to a point)?

No. Most of time the PC will not boot, but somehow the PC can boot. So you may try to tweak the timing with 4 or even with all, like lower the speed to 1333mhz manual in the BIOS memory section, or between 1333mhz and 1600mhz, then try boot the PC to see what happens.

 

[Fyrmn472]

Weird. BIOS is set to "AUTO" for memory frequency so it automatically caps to the maximum supported frequency so it works fine without lowering it manually.

I just think it's odd that the 12GB of memory works perfectly but won't boot with anything more than 12GB. No worries, the added memory was only a temporary fix until I get all my new components and build the new PC. Thanks again for taking the time to respond!

 

[TJ Hooker]

FYI, only RAM purchased together as a single kit is guaranteed to work together. Combining different kits (even if they're all the same model) may work, but it can cause issues like instability and/or failure to POST.

 

[Fyrmn472]

Now that would make total sense! I read that could be an issue, but I when I scrambling for memory, I couldn't find a 24GB kit (6x4GB).