I have a situation on my hands that I need to figure out. So first off, I just recently built an AMD based gaming/workstation PC. These are the specs:
Motherboard: ASUS Sabertooth 990FX
CPU: AMD FX 8350 "Vishera"
GPU: Sapphire Radeon HD 7970
RAM: Patriot Viper Xtreme 8GB
PSU: Corsair HX850
So my question is in regards to RAM. I'm looking to upgrade my RAM kit but I'm a little confused as to what's supported natively in the memory controller for the Vishera chip and what's supported on the Sabertooth mobo.
I read somewhere that the FX 8350 supports 1866 RAM in dual channel mode, but when in a quad channel setup the speed is throttled down to 1600. So does this mean that if I buy a quad channel kit @ 1866, the CPU will only support 1600 speeds? Would buying a dual-channel kit be the only way for the CPU/RAM to natively utilize 1866 speeds?
I've been looking at this kit from G.Skill that is a dual channel 1866 16GB kit with an incredibly low CAS:
From what you said yes, the CPU will only support the speed of 1866MHZ while in a dual channel config, if you use a quad channel config it will turn the memory down to 1600MHZ
Your link isn't working for me.
While the memory would operate at 1600MHZ it would also probably operate at a lower timing but you would probably be better of going with a 1600MHZ memory since its cheaper. Going faster on memories is not always helpful since the timing also goes up, the best bet is to find the memory that has the lowest timing for the frequency that fits your hardware.
For 1600MHZ memories the lowest timings i came to find was 7-8-7-24 but recently the best i got when i updated my system was 9-9-9-24
I would recommend going with the 1600MHZ model, like i said the timing usually even out the difference of speed so you're left with going dual channel or quad channel and i guess that's an easy choice.