memory controller question

tech-wreck · Jul 26, 2015

the 4790K supports 1333 and 1600mhz ram.
the motherboard supports 1333, 1600 and 1866mhz ram.

correct me if i'm wrong, if i were to fit 1866mhz ddr3 i would need to overclock the IMC on the cpu to run the memory at that speed, yes?

with the memory controller on-chip, can i disregard the motherboard manufacturer's specs and overclock the IMC higher to run 2400 or higher memory, assuming i have enough cooling headroom?

Tradesman1 · Jul 26, 2015

Yes you can run higher DRAM, many 4790K will run up to around 2133 with the CPU at stock, that or higher may take a small OC of the CPU itself, on my two 4770K builds (I run 32GB on each) the Z87 runs 2666 sticks and the Z97 runs 2800 sticks (bothe in sig). Additionally running the higher data rates doesn't have any negative affects on the CPU, so you'll be fine

tech-wreck · Jul 26, 2015

i plan to overclock the processor anyway...
i'm not limited to 1866mhz, then? why do manufacturers list the 'supported' memory speeds, when their motherboard doesn't control the memory?

Tradesman1 · Jul 26, 2015

That's to let you know the mobo is capable of higher DRAM data rates, the key though is they don't tell you you will normally need a K model CPU to run 2133 and up. Some of the lower end 1150 chipsets top out at 1600 DRAM

tech-wreck · Jul 26, 2015

okay, so the mobo spec sheet says 1866mhz, is that the absolute maximum data rate i could achieve, even though the processor is capable of much more?

Tradesman1 · Jul 26, 2015

What mobo - sounds like a Sabertooth, if so yes they can run higher data rates

tech-wreck · Jul 26, 2015

it's a Z97 gryphon - it had to be mATX or i'd have gone for RoG or sniper.

link https://www.asus.com/uk/Motherboards/GRYPHON_Z97/specifications/

Tradesman1 · Jul 26, 2015

Yes the Gryphon can handle higher DRAM, it's like the Sabertooth in that they sort of bill it for stability, but in the QVL they list DRAM up through 2800+

http://dlcdnet.asus.com/pub/ASUS/mb/LGA1150/GRYPHON-Z97/GRYPHON_Z97_Series_memory_QVL.pdf

tech-wreck · Jul 27, 2015

great stuff, thankyou. i couldn't find the QVL, but then i was browsing with my phone...
i read Ryan's post about IMC overclocking and the extra heat that produces. hopefully the cooling system i am installing will be capable of moving enough heat to allow 3200mhz RAM (100% mc OC)... but is it worth the outlay over, say, 2400? does it scale? is 3200mhz 33% faster than 2400?
i have only used up to 1600 myself and apart from enabling XMP i haven't tried any memory overclocking before.

Tradesman1 · Jul 27, 2015

Faster DRAM can provide increased performance but it's on a small scale. Not equivalent to a percentage as you indicate in your 2400 - 3200 example

tech-wreck · Jul 27, 2015

that sounds like 'diminishing returns', way beyond my comfort zone...
i'm thinking the 2400-2800 range will be a good place to look for a decent compromise of cost/performance/heat.
talking of heat, do DIMMS get hot enough to warrant their own fans or waterblock, or is the heat spreader and good airflow enough?

Tradesman1 · Jul 27, 2015

Yes, and again depends on what you do, for most people 2133/2400 is good if they really use the rig (multitasking, higher end apps, large data sets, VMs, etc.....the the prices tend to up up for 2666 and up, so then it becomes individual justification if the added cost will be covered by production gains

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