CPU and GPU at the same time?

[Tidsdilatation]

I got two "computers". One mining rig currently running 5 rx580 + an i5 processor. I run xmr-stak and mine with both CPU and cards on the same algo and there is absolutly no loss in hashrate. Same with my gaming computer, i run a 1080ti on ethash with 52mh/s while running my ryzen 7 1800x on xmrig with about 620 H/s. So yes, it is very much doable.

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[2stout]

Yes, it's possible and has been done.  Depending on CPU, may need to specify the maximum minimal amount of threads in order to get the most out of CPU mining without causing GPU mining bottlenecks.

[Ajiloveyuyun]

if you have high-end computer specifications it will not have any problems or crashes .. usually computers that crash often it is in power supply and windows updates.
2 it is often experienced by miners. so you focus both problems if you want to use GPU and CPU

[togoshigekata]

Yes totally doable!, Just make sure theres still a little bit of CPU available for the GPU mining to use,

If you want good CPU coin check out BiblePay (BBP)

BiblePay (BBP)
- 10% mined coins always go to Charity (currently sponsoring 329 Orphans monthly!)  
- ASIC-Resistant like Vertcoin/Groestlcoin (CPU Mining Only)  
- fork of DASH (Masternode Governance, Proposals & Voting), Live 10% Monthly Budget
- Proof of BibleHash (POBh) algorithm, All Nodes are Full Nodes  
- Ranked #145 in Code Commits

630+ million BBP coins in circulation, 5.2 billion by Year 2050

Launched July 23rd 2017, Market Cap $2 million, $0.003 per BBP
https://coinmarketcap.com/currencies/biblepay/

38% of BiblePay coins are rewarded to Healing and Curing with Distributed Computing [Contributing CPU Cycles to Science Research]
- Rosetta@home (Cancer, AIDS/HIV, Malaria, Alzheimer’s)
- World Community Grid (Cancer, AIDS, Zika, Tuberculosis, Clean Energy, Ebola)

Mining Guides:
https://www.reddit.com/r/BiblePay/comments/6umlqq/how_to_mine_biblepay_on_windows/
https://www.reddit.com/r/BiblePay/comments/6ummuj/how_to_mine_biblepay_on_linux/