Using the dual cable should work just fine. But assuming that psu is 1000w it may be stretching it a bit, thus the warm cables. If you have a 1300w psu the cables will barely be warm.
It's not going to be stretching it at all. The RM1000 delivers 1000W and 83.3A of sustained power through the 12V rail. The S3 is 340W running stock, 366W at 478 and 390 at 504. You are well within the PSU specs running two over clocked S3s on it. 
Topic: Overclock 2 Antminers S3 using Corsair RM1000 (Read 871 times)
Using the dual cable should work just fine. But assuming that psu is 1000w it may be stretching it a bit, thus the warm cables. If you have a 1300w psu the cables will barely be warm.
You could try but it might pull too much and make the wires warm or burn up.
I want to OC my 2 s3.
I have corsair RM1000 PSU, it comes with 6+2 PCI cables,i only have 4 cables but both cables have a split at the end and comes with 2x 6 pin at the end, like in this picture :
I know i need to power all 4 slots in the S3 if I want to OC, can i use 1 cable to power 2x6 pin slots ?
I have corsair RM1000 PSU, it comes with 6+2 PCI cables,i only have 4 cables but both cables have a split at the end and comes with 2x 6 pin at the end, like in this picture :
I know i need to power all 4 slots in the S3 if I want to OC, can i use 1 cable to power 2x6 pin slots ?
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