How do I stress one of two different GPUS on my system?

Rondo Anderson

Commendable
Oct 21, 2016
34
0
1,540
System:
AMD fx 8370 @4.4Ghz
on an Asus m5a97 le r2.o (my next upgrade)
3tb hard drive, no ssd( another soon to come upgrade)
Geforce GTX 660 (my main card atm)
AMD Radeon HD 5450 with aftermarket fan (just for more ports)
5 monitors.



I am overclocking both GPUs, but when I stress test, only the 660 is used. How do I stress both/the other one?