Just found this posted by the EVGA Product Manager on the EVGA forums...
Official reply:
"The way the EVGA GTX 970 ACX heat sink was designed is based on the GTX 970 wattage plus an additional 40% cooling headroom on top of it. There are 3 heat pipes on the heatsink – 2 x 8mm major heat pipes to distribute the majority of the heat from the GPU to the heatsink, and a 3rd 6mm heatpipe is used as a supplement to the design to reduce another 2-3 degrees Celsius. Also we would like to mention that the cooler passed NVIDIA Greenlight specifications.
Due to the GPU small die size, we intended for the GPU to contact two major heat pipes with direct touch to make the best heat dissipation without any other material in between.
We all know the Maxwell GPU is an extremely power efficient GPU, our SC cooler was overbuilt for it and allowed us to provide cards with boost clocks at over 1300MHz. EVGA also has an “FTW” version for those users who want even higher clocks.
Regarding fan noise, we understand that some have expressed concerns over the fan noise on the EVGA GTX 970 cards, this is not a fan noise issue but it is more of an aggressive fan curve set by the default BIOS. The fan curve can be easily adjusted in EVGA PrecisionX or any other overclocking software. Regardless, we have heard the concerns and will provide a BIOS update to reduce the fan noise during idle.
Thanks,
EVGA"
My response...
In other words they're fine with just those two HPs fully contacting, and couldn't care less if the 3rd only barely touches the edge of the GPU, if that. So you basically have 22mm of total HP width, of which only around 17mm (77%) is being used.
No, this is not a defect, or even an oversight, it's EVGA's apathy. The fact that they held out so long before even considering an aftermarket cooler even when everyone else had them kinda makes that obvious.
And if it were really down to manufacturing costs, we'd see higher pricing on ALL the custom aftermarket coolers that others are having made FOR the 970. No, this is just EVGA seeking a higher profit margin.
I could have found what I was feeling to be their apathy before bothering to call them just by looking here, but I'm glad I did, because the run around and apathy I got there made it clear EVGA is not what they used to be, maybe they never even were.
1) First call, tech dept. Says he's unaware of the problem and will relay it. Admits it could effect thermal efficiency after looking at the pics of the placement of the GPU TIM imprint being well off center of the heat pipes.
2) Second call, presales dept. Keeps saying he cannot comment, so I merely ask him to relay the info, but his incessant NDA toe-the-line attitude causes me to say thank you and hang up.
3) Third call, customer service. Says he just got a response about this issue from what he claimed to be the design team and would forward it to me. Instead my email is from a tech named Darrel and only contains a link of the article I told THEM about.
Yeah, so, EVGA, if you're going to be so stuffy and apathetic, at least let us know up front instead of pretending to care, because you're just wasting our time with this crap. Going to be looking at Giga and ASUS offerings instead.