Crossfire question and a few others.

[valdex]

Hey guys I have a few questions for those who are experienced in these situations
been here a while and never really posted, just lurked but cant find anything on my current situation. so here it goes

Current system
NZXT Razer Case
Ultra X4 850W Modular PSU
Asrock Fatality 990fx killer
AMD 8350 vishera with hyper evo 212
corsair xms3 12 gb of ram ddr 3 1600 (had 16 1 stick died a year ago, ram is pretty old now)
1.5 tb western digital Hdd (yea no SSD yet 😛)
XFX R9 390 8gb
win 10

so here are my questions.

1. a friend of mine wants to send me his sapphire 390, is this card able to be crossfired?

2. if so is my PSU able to handle this? if not any recommendations? modular please 😀 I love cable management. If my PSU is capable where can I buy extra 8pin or 6 pin PCIe cables? lost my extras in a move T_T

3.are my current temps safe for doing this? Idle my cpu and gpu is around 38-42c (this changes in the winter big time) and around 55-63c during gameplay both GPU and CPU (temps tested with radeon cimson, CAM, core temp, H/w monitor. should I get water cooling? if so recommendations?
I don't overclock so if my temps are great then no need to go water cooling. I have CAM Set up to up my fan speed to 100% to keep it cool during games. if you think I should change this by all means let me know.)

4. my computer randomly restarts occasionally doesn't matter what I'm doing but its mostly during games it happened before I put the 390 in so I'm ruling out the video card ( just got the 390 few days ago, this has been happening for months) I'm at a loss here as I cannot reproduce this completely random situation... any ideas?

well thanks guys if anything pops up I have a question about ill ask away but this is all I can think of at the moment. thanks for your time.

EDITED also any clue where I can buy extra 6pin or 8 pin Modular cables for my PSU? I lost my extras in a move 🙁 thanks again

 

[anti-duck]

1. Yep

2. I'm not too familiar with your PSU, but 850w is just enough.

3. Temps are fine.

4. I'd start by checking all the cables are firmly connected to the motherboard.

 

[geofelt]

1. Yes.
2. No, more like 1000w.
You might consider replacing the psu. It is considered tier 5, dangerous, replace asap.

http://www.realhardtechx.com/index_archivos/Page362.htm
3. If your case has good ventilation, I would expect to see 10-15c. over ambient at idle.
FX-8350 is more intolerant of high temperatures than Intel.
I think you are at about the limit now.
Even with a good overclock, the FX cores are slow, compared to Intel. Typical passmark single thread rating of FX will be 1500, with Intel, 2100
If cpu is your limitation for gaming, then I would save the liquid cooling budget and target a change to Intel of some sort.
4. I might suspect that temperature has something to do with the restarts.
Possibly the cpu is failing. It is unlikely, but it does happen.
I might also consider that your psu is the culprit.
Try running with a different known good psu.

On crossfire, you will win fps benchmarks with dual gpu, but gameplay is better with a single good card.

 

[anti-duck]

Bear in mind these are 390X's -

http://www.tweaktown.com/tweakipedia/91/amd-radeon-r9-390x-crossfire-4k/index.html

You can get away with 850w.