Scythe Fuma i7-7700K Performance

Just got the Scythe Fuma yesterday. I'm not sure if I've got it properly tightened. I tightened with as much as I thought it needed, then tried it out. Was good, but not as good as I thought it would be. I tightened it some more and got about 2C lower temps. But it's still not where I thought it would be.

I tested w/ Prime95 v26.6 10 mins @4.7GHz 1.300V with my previous Cryorig H7, 97C max.

Scythe Fuma same settings 88C max.

I've got it running P95 now at 4.5GHz (enhanced turbo) @1.200V max 71C (*went up to 72C, then 74C while typing).

Does this seem about right for this cooler?

i7-7700K
Scythe Fuma Rev. B (Scythe thermal paste)
MSI Z270M Mortar
2x8GB DDR4 2400 CL 14 1.20V Corsair Vengeance @3200MHz CL16 1.35V
EVGA GTX 1070 SC
2xSSD (SATAIII), 2xHDD
SeaSonic PRIME Gold
Phanteks Eclips P400
3x120mm intake, 2x120mm exhaust
Reply to MrN1ce9uy
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More about scythe fuma 7700k performance
  1. What are your ambient air temps?
    Reply to Lutfij
  2. It's seems right to me. The 7700k runs hot. I had to delid mine in order to improve the temps. I have a single 140mm cpu fan cooler and I had 73C in gaming, at 4.5GHz. Before I had 83C. So, best way to improve the 7700k temps is delidding, assuming you have a good cooler...and you do.
    Reply to envy14tpe
  3. Ambient is 21-22C
    Reply to MrN1ce9uy
  4. I don't think I'll be delidding, I'd like to sell the CPU at some point.

    If I wanted to replace the Scythe Slipstream fans on the cooler, what would be some good options?

    *It's probably not worth the cost of the fans. I'll either be content or get a 280mm AiO.
    Reply to MrN1ce9uy
  5. I had another thread asking about the towers being bent inward, I bent them back out. (see: http://www.tomshardware.com/answers/id-3520572/scythe-fuma-middle-fan.html) But I RMA'd for a refund today. I'll be sending it back. After several re-installations I've noticed it will not make full contact with the CPU. It always looks like this no matter how tight I screw it down:





    I put my Cryorig H7 back on and I could be just as satisfied with it.
    Reply to MrN1ce9uy
  6. That's some terrible contact. Yeah, I'd get rid of that cooler. Did you try reapplying thermal paste using different amount of paste?
    Reply to envy14tpe
  7. envy14tpe said:
    That's some terrible contact. Yeah, I'd get rid of that cooler. Did you try reapplying thermal paste using different amount of paste?


    I didn't want to use too much, but I did try putting a thin line of grease and not spreading it, it seemed to make better contact after I removed it, but temperatures were the same.

    *I literally tightened it as much as I could, still not any better. I tried loosely tightening it and a little in between. Still temps were only slightly better than the Cryorig H7 as far as normal gaming temps, sometimes worse.
    Reply to MrN1ce9uy
  8. Hey, what's your Prime95 temp at 4.7 w/ Cryorig h5? What voltage? Just a 5-10min temp is all I'm wanting to know.
    Reply to MrN1ce9uy
  9. MrN1ce9uy said:
    Hey, what's your Prime95 temp at 4.7 w/ Cryorig h5? What voltage? Just a 5-10min temp is all I'm wanting to know.


    I don't use Prime95. I only use AIDA64. I believe it was 1.35V @4.7GHz, and temps got up to 85C. It made me realize...leave it at 4.5GHz until I do some serious cooling. Obviously unimpressed with temps and cooling system needed for overclocking.
    Reply to envy14tpe
  10. My original account MrN1ce9uy isn't working properly. But I wanted to share.

    I sent the Fuma back and bought the NH-D15S.

    I've found the Fuma and NH-D15S are designed very similar, while the Noctua makes better contact, they both require putting a small blob/dot in the center instead of spreading a thin layer or else they wont' make full contact.

    I say this because I put the blob in the center on the Noctua, pulled off and wow it spread all over. Thought it was too much, tried the thin layer, temps were higher. Pulled off and similar poor contact as with the Fuma.

    I'm getting very similar performance out of the Noctua as I did the Scythe. The Noctua is much better quality though, fan clips were a breeze compared to the Fuma and screws came to a definitive stopping point when tightening.

    Either way, I'm disappointed in the i7-7700K's overclocking performance. I believe it is most economical to run at 4.5GHz, which can be done on a Cryorig H7. If I had to buy a cooler and didn't have one, I'd go with a Cryorig H5 for a clean look and good temps without breaking the bank.

    *NH-D15S 4.7GHz 1.300V - 86C Max Prime95 Small FFT
    Reply to volkgren
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