Ray,

I would not mix memory with different specs, even in different banks.  They don't always play well together.  8GB is the max size your mobo shows for each slot.  The Ballistix CT5572408 is 4x8GB with CAS 11.  

Have you pulled down the Memory Support List?  

https://www.gigabyte.com/Motherboard/G1Sniper-M5-rev-1x#support-doc

It only covers RAM that they tested, but it can give you an idea of the types and speeds that they verified.  One is G.Skill 32GB (4x8GB) kit that's 2133 with CAS 9.

Whatever you get, make sure you enable XMP mode in the BIOS or it will run at 1333 instead of 2133.

My system is a little older than yours.  In fact, I placed the NewEgg order five years ago today.  It's an ASUS z77 that has G.Skill Ripjaws DDR3-2400 4x4GB.  I'll see how my [email protected] holds up with v4 over the next several weeks.  Then it will either be a Kaby Lake i7 or wait for a 6-core Coffee Lake.

Hi Larry,

Yes I have the MSL. I did wonder why there were no modules greater than 8Gb. So I have to go with 4 x 8Gb 2133 CAS 9. Thanks. That clears things up nicely. I would prefer Corsair but will try to keep an open mind.

I'll also check XMP Mode is enabled, thanks.

Having searched unsuccessfully for similar memory modules to my existing 2 x 4Gb Corsair Dominator ones I've drawn a blank. Neither can I dump existing memory and upgrade to 4 x 8Gb modules as Win 7 HP only supports a max of 16Gb.

I'm now weighing up my options but it now seems likely I'll buy a new PC. I already have a GTX 1080 so the upgrade cost is reduced considerably. I will have had this one for 4 years in the autumn and it's served me well. It may well suit someone who is happy to stay with FSX.

After speaking to Scan (UK) this morning they confirmed my existing RAM is no longer available. They recommended the following as a decent replacement. I'm limited to 16Gb as I have Windows 7 Home Premium.

16GB (2x8GB) Corsair DDR3L Vengeance Pro, Red, PC3-14900 (1866), Non-ECC Unbuffered, CAS 10-11-11-30, XMP 1.3, 1.35V

I asked whether the voltage was okay given my existing memory is 1.5v. He assured me it is.

Interesting that Win7 Home limits the RAM. Anyway, my understanding is that in a dual channel system if overclocking the CPU then stick to a single dual channel RAM kit, if not overclocking then add all you can but all the RAM will run at the speed of the slowest modules installed.