Octane GPU Render Hardware

  • Octane render speed (version 3 and 4) directly related to GPU power and count
    • octane 3.07 and below don't support RTX 20xx and GTX 16xx GPU,
    • octane 3.08 and 4 above support RTX 20xx and GTX 16xx GPU,
    • octane 3 and octane 4 use different benchmark points
GPU cost2019 Octane bench 3.06 (eff) octane 4 Watt Power Pin count PSU total Eff
1060 3GB 280 79 (0.28 ppd) 80 (0.29) 120W 6pin S12II 520W (75) 0.22
1070 Ti 600 135 (0.22 ppd) 153 (0.26) 180W 8pin S12II 520W (75) 0.2
1070 Ti + 1060 3GB 880 228 (0.26 ppd) 240 (0.27) 300W 6+8pin S12II 620W (91) 0.23
2x 1070 Ti 1200 » 273 (0.23ppd) « 312 (0.26) 360W 2x 8pin S12II 620W (91) 0.21
3x 1070 Ti 1800 » 386 (0.21ppd) « 446(0.25) 540W 3x 8pin M12II 850W (140) 0.198
4x 1070 Ti 2400 507 (0.21ppd) 614 (0.26) 720W 4x 8pin PrimeUltra1000GD (240) 0.192
1070 Ti 2nd hand 380 135 (0.36ppd) 153 (0.4)
1080 Ti 2nd hand 700 185 (0.26ppd) 219 (0.31)
1080 Ti 1200 185 (0.15ppd) 219 (0.18) 250W 8pin+6pin S12II 520W (75) 0.15
2x 1080 Ti 2400 375 (0.16ppd) 430 (0.18) 500W 2x8pin+2x6pin PrimeUltra1000GD (240) 0.14
3x 1080 Ti 3600 553 (0.15ppd) 647 (0.18) 750W 3x8pin+3x6pin Prime 1300GD (293) 0.14
RTX 2070 710 209 (0.29) 175W 8pin S12II 520W (75) 0.27
RTX 2080 1100 225 (0.20) 215W 8+6 S12II 520W (75) 0.19
RTX 2080 Ti 1725 303 (0.18) 250W 8+8 S12II 520W (75) 0.17
2x RTX 2070 1420 409 (0.29) 350W 2×8 S12II 620W (91) 0.27
3x RTX 2070 2130 »621 (0.29)« 525W 3×8 M12II 850W (140) 0.27
2x RTX 2080 2200 441 (0.2) 430W 2×8+2×6 PrimeUltra1000GD (240) 0.18
3x RTX 2080 3300 582 (0.18) 645W 3×8+3×6 Prime 1300GD (293) 0.16
2x RTX 2080 Ti 3450 588 (0.17) 500W 2×8+2×8 PrimeUltra1000GD (240) 0.16
3x RTX 2080 Ti 5175 849 (0.16) 750W 3×8+3×8 Prime 1300GD (293) 0.16
  • Conclusion:
    • (3300 SGD budget - 588 @O4) for RTX 2080 or 2080 Ti?
      • Go for 2x RTX 2080 Ti, it is better than 3x RTX 2080 setup, 4 PCI-E connection better to manage.
    • (2200 SGD budget 621 @04) for 2x RTX 2080 or 3x RTX 2070?
      • definitely for 3x RTX 2070, only 3 PCI-E connection to manage and 50% more power.
    • (700 SGD budget 209 @O4) RTX 2070 vs GTX 1080 Ti 2nd hand?
      • for octane 4, definitely go for RTX 2070, it is better and newer
      • for octane 3, you can only go for 1080 Ti
    • (700 SGD budget 312 @04 2nd hand) RTX 2070 vs GTX 1070 Ti 2nd hand?
      • for price of RTX 2070, you can get 2x GTX 1070 Ti 2nd price.

Final Conclusion

  • 2070 and 1070 single 8pin PCI-E power connection is great for multi-GPU and easy Power Supply setup. as even 850W PSU can power 3 of them.
  • for 2nd hand price, it is better to buy 3x GTX 1070 Ti at 380×3 = 1140 SGD with 850W PUS (140SGD).
    • total = 446 @ O4 score, best for price, only outperformed by 3x GTX1080 Ti (more expensive)
  • for brand new card, it is better to buy 3x RTX 2070 at 710×3 = 2130 SGD with 850W PUS (140SGD).
    • total = 621 @ O4 score, best for price, only outperformed by 3x 2080 Ti (more than double price.)
PSU (Seasonic) Connector cost2019
S12II 520W 2 PCI-E max 75
S12II 620W 2 PCI-E max 91
M12II 850W 3 PCI-E max 140
PrimeUltra1000GD 4 PCI-E 240
Prime 1300GD 6 PCI-E 293
  1. for mATX motherboard, maximum 2 GPU can be plugged. (PCI-E 3.0 x16 + PCI-E 2.0 x4)
    • and 2nd slot may block front panel pin connection, so you can use front usb
    • example: Asrock B350m Pro4
  2. for ATX motherboard, maximum 2 GPU for cheap board, and you have free room for front panel pin connection
    • example: Asrock B350 Pro4, B450 Pro4
  3. for better ATX motherboard, maximum 3 GPU can be plugged (PCI-E 3.0 x8 + PCI-E 3.0 x8 + PCI-E 2.0 x4)
    • however, some motherboard pin may be blocked by last GPU, but some motherboard has better pin arrangement for this issue
    • example:
      • Asrock X370 Taichi
      • MSI X370/X470 GAMING PLUS AM4
  4. For 4x GPU or better 3x GPU setup, only high-end CPU board, like X399 series board for AMD TR 2950X can have 4 slot
    • some cheap x399 board has 4 slot, but spacing is better which cause only 3 slot can take GPU, like MSI MEG X399 CREATION sTR4
    • example:
      • ASRock X399 Taichi sTR4, Asrock Fatal1ty X399, 4 Slot with 2 card spacing.
      • GIGABYTE X399 AORUS Gaming 7 sTR4 has 5 slot, but only 4 slot can be used to take 2 card spacing

Additional Concern

  • for 3 GPU setup or better 2 GPU, those motherboards are better spaced for either fan design type GPU, but of course, Trip fan type are better than blower type in this case
  • for 4 GPU setup or those 4 slot motherboard, due to 2 card slot spacing, Blower type is prefered to avoid GPU heat causing clock speed capped.
  • Better Casing cooling and Case fan flow control (cleaning and maintain dusts) are always better to keep GPU at high load.
  • Those multiple GPU oriented maker all make blower type, like leadtek, zotac, and of course expensive Asus.

GPU if too long, it can also block SATA connectors and USB3 contector in some case

  • like leadtek GTX 1070 Ti WindForce is too long in some case and motherboard combination
  • some small card like Zotac 1070 Ti mini is small like normal 1060 cards, can fit better in either main slot or last GPU slot without causing pin blocking.