New HTPC Milo ML08 GPU Cooling Which Method Rear or Internal Exhaust

[silversurfernhs]

TLDR:
For this case, would stock rear exhaust work best or would getting an internal air exhaust HSF like the ACX coolers help cool a 680 better?

Silverstone Milo ML08
4770 Stock cooler (ordering a Cryorig C7 soon)
850 Pro 512 GB SSD
WD Blue 500GB HDD
8GB Corsair Value 1333 C9
GTX 680 FTW+
Silverstone 600W SFX

I built a HTPC box out of leftovers and a new case, and i'm wondering how best to cool the GPU.

http://www.silverstonetek.com/product.php?pid=607

My solution for the moment is to run the fans in "aggressive" mode to keep GPU temps around 80C and i'm going to tweak the power target to be lower to see if i can get the temps to behave a bit better.

Aside from that i am wondering what you think would provide better cooling in this situation?
Rear exhaust stock fan shroud, or one of those double/triple fan internal heat exhaust HSFs?
This raises the temperatures of other components to mildly uncomfortable levels, as the HDDs are on the other side of the GPU. HDDs, will get up to 56 in some cases, but usually hover around 45C. CPU hovers around mid to high 70s, but i'm hoping a Cryorig C7 with some Gelid compound will help. Maybe even re-doing the compound on the GPU HSF, as the GPU is quite old.

Rear GPU exhaust has suited most of my PCs best so far, but with this one, i don't have to worry too much about overheating a huge array of hard working disks.

The case has openings over the CPU, PSU and GPU to either exhaust or let air in.

Any insight would be helpful, and a bonus for any help with keeping the HDDs from getting too hot would be awesome. The mainboard has a bunch of fan headers that aren't in use as well.

I plan on adding at some point some slim 140mm fans to the inlets, underneath the filters.

 

[Lutfij]

By design and function the cooler on the ACX will dissipate it's heat around the card and into surrounding area's which if it were a regular ATX chassis would've introduced a problem with higher temps inside the chassis. Blower style cards are good to let it's own heat exhaust out the back I/O port area but can and will impeded overclocking or high detail settings when in game.

Since the ML08 has a chamber separation, I'd say go for the ACX version while you have the GPU above the motherboard/CPU area to exhaust as much heat as possible due to natural convection/ventilation, i.e: handle side up.

 

[silversurfernhs]

By design and function the cooler on the ACX will dissipate it's heat around the card and into surrounding area's which if it were a regular ATX chassis would've introduced a problem with higher temps inside the chassis. Blower style cards are good to let it's own heat exhaust out the back I/O port area but can and will impeded overclocking or high detail settings when in game.

Since the ML08 has a chamber separation, I'd say go for the ACX version while you have the GPU above the motherboard/CPU area to exhaust as much heat as possible due to natural convection/ventilation, i.e: handle side up.

Thanks for your feedback. I think i'm going to find a cheap used 780 acx and use the 680 in a system better suited for the blower.