Octane Render info

(updated: 2023.01)

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

2022 update

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.)

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
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
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
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

some riser card may solve the block pin issue, but not ideal for both case and stability
- http://tomglimps.com/custom-pc-for-otoys-octane-render-by-polder-animation/

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.