Recommended minimum CPU speed for a 6/7 gpu ZEC/ETH rig?

[topgeek]

I'm building an LGA 1150 rig with 6 or 7 GPUs for zcash and ethereum mining. (MSI Z97 gaming 5 mb).

Is there a recommended minimum CPU speed or can I go all the way down to something like a $40 celeron with no impact on the rig's mining performance (dedicated GPU miner only).  For example would a $44 Celeron G1840 be fine or is there merit in performance impact in spending the extra and going to an i3 or i5?  I don't want to skimp on a $2000 rig with a $44 processor if it'll negatively impact mining - but I also don't want to put a $200 processor in it if it is literally wasted money as this machine will have no other functions. (I have plenty of other powerful machines here that are the "daily drivers").

cheers and thanks for the input. 

[Starsky886]

Hi!

I actually have 96 gpu 470 running on 990fx mobo, with 4gb of ram and cheap fx-4300 cpu... I also have a pc with a i7 in it and it does not influence the speed of my mining...
Same speed with the FX-4300 vs the i7
So, any cpu will make the job in my experience

[topgeek]

That's what I was figuring from watching CPU usage on my current mining rigs that have high end CPUs (next to no cpu usage depending on the miner - i.e. claymore is efficient).

thank you for the feedback!