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CPU requirements for Folding

It depends. Newer generations like Haswell? You could probably get away with one thread per GPU on 3Ghz+ models. Nehalem or SandyBridge? Definitely one core per GPU.

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Ignis (Primary rig)
CPU
 i7-4770K                               Displays Dell U2312HM + 2x Asus VH236H
MB ASRock Z87M Extreme4      Keyboard Rosewill K85 RGB BR
RAM G.Skill Ripjaws X 16GB      Mouse Razer DeathAdder
GPU XFX RX 5700XT                    Headset V-Moda Crossfade LP2
PSU Lepa G1600
Case Corsair 350D
Cooling Corsair H90             
Storage PNY CS900 120GB (OS) + WD Blue 1TB

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Server 01Alpha                                       Server 01Beta                            Chaos Box (Loaner Rig)                Router (pfSense)
CPU
 Xeon X5650                                      CPU 2x Xeon E5520                    CPU Xeon E3-1240V2                     CPU Xeon E3-1246V3
MB Asus P6T WS Pro                               MB EVGA SR-2                             MB ASRock H61MV-ITX                 MB ASRock H81 Pro BTC
RAM Kingston unbuffered ECC 24GB  RAM G.Skill Ripjaws 16GB         RAM Random Ebay RAM 12GB    RAM G.Skill Ripjaws 8GB
GPU XFX R5 220                                       GPU EVGA GTX 580 SC               GPU Gigabyte R9 295x2                GPU integrated
PSU Corsair CX430M                               PSU Corsair AX1200                   PSU Corsair GS700                         PSU Antec EA-380D
Case Norco RPC-450B 4U                      Case Rosewill  RSV-L4000C        Case Modified Bitfenix Prodigy   Case Norco RPC-250 2U
Cooling Noctua NH-U9S                        Cooling 2x CM Hyper 212 Evo  Cooling EVGA CLC 120mm           Cooling stock
Storage PNY CS900 120GB (OS)           Storage null                                 Storage PNY CS900 120GB (OS)  Storage Fujitsu 150GB HDD
               8x WD Red 1TB in Raid 6                                                                                WD Black 1TB    
               WD Green 2TB

 

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Like Me1z said it depends on the CPU generation you're looking for.  If you go Ivy Bridge and up then 1 thread per GPU is fine  :)

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With GPU folding I find that's its always best to have 1 core per GPU, though I've also found that some CPU's from the LGA775 days need to have 2 cores reserved per GPU.

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