Sandisk Plus 240 gb overheated

So I’m trying do some comparison by switching the slot of SSD.

Before this I’m putting my SSD on Primary slots (replacing old hdd) and put the old HDD in optical bay (using hdd caddy).

1472550770330.jpg

Now I’m switching the slot so my SSD will be in optical bay/secondary slot and noticed some significant changes in temprature:

1472564547141.jpg

Well, I think that’s because my laptop primary hdd slot is so close to the processor and the heatsink fan, while the optical bay slot is placed in different side of laptop.

But also there is little difference in performance. 

In primary slot:

crystaldiskmark5_22082016.jpg

In optical bay/secondary slot:

crystaldiskmark5_30082016_caddy.jpg

So, how do you think about it? Should I keep my SSD in optical bay/secondary slot so the temprature will be cooler or just put it in Primary slot so it will be slightly faster (but warmer)?

I would appreciate for any suggestion. Thx.