Crashman :
I have an engineering background, and can tell you that it's completely satisfactory. In fact, it was one of the primary features of original ATX tower ventilation.
Be the engineering background as it may, the original ATX specifications were designed for a completely different time, to address completely different problems, and they didn't account for completely different needs.
At the time the ATX specifications were originally designed (1995), nothing was remotely like it is today.
Are you trying to argue that top mounting a PSU is fine in 2012 because it was fine in 1995?
That was shortly after the Pentium 1 was created. The Pentium 1 was 60 Mhz single core, now we have out of the box processors that are commonly 3.1 Ghz quad cores. I don't remember exactly, but I am going to go out on a limb and say the Pentium probably used all of 15 watts of power. Now 10x that on an OCd processor doesn't shock anyone.
Video cards today can easily pass 500w of power usage. Video cards back then could get by on about 25w.
That difference in wattage shows up as heat inside the case.
I don't think there is anyone who would even try to competently argue that today's computers are not hotter than those of 1995.
The designers of the ATX specification in 1995 didn't need to account for huge amounts of heat inside the case because there wasn't huge amounts of heat inside the case. Their plan was clearly to efficiently move a bare minimum amount of air through the case to get the mare minimum amount of heat out of the case.
Indeed, the PSU exhaust fan was usually the only fan on a computer from 1995, even if it was a gamer PC.
These days, that would be a good way to experience all kinds of stability problems.
Fast forward to 2012 and it just doesn't cut it to have only one fan on a PC unless it is a super low power HTPC and sometimes not even then.
It also doesn't cut it in 2012 to have all the heat from inside the case sucked into the PSU, again especially not for gamer cases since they generate so much more heat than HTPCs.
Having all that heat go into the PSU has an immediate effect of reducing the maximum wattage that the PSU can sustain and a long term effect of degrading the PSU internals at a much faster rate than they otherwise would.
Top mounted PSUs will perform worse than the same PSUs bottom mounted every single time as long as the PSU on the bottom is capable of intaking air like it is supposed to be able to. It isn't even a competition, I seriously hope nobody tries to argue this point.
In 1995, using the PSU fan for double duty to suck the heat out of the case just oozed efficiency. There was no good reason to bottom mount the PSU and force PC makers to add an additional fan up top.
In 2012, one fan can't even power optimal airflow and it is about the least efficient way to do it to use the PSU fan to suck all the air out of the case.
My case, which is attached to a computer worth maybe $600 has 7 fan mounts, all of which have attached fans. For a computer valued at twice as much you should be able to expect at least as much. The HAF 912 would not have been too much to ask for the $1300 PC.
That all wouldn't be so bad if the $1300 PC had a PSU that was really conservative for the PC that it was running, but it doesn't. The PSU is actually pretty aggressive.
It is advised by the PSU manufacturers that people should generally run their PSUs at approximately 50% load in order to the the maximum longevity out of the PSU.
Obviously, there is a wide range of power values used by a computer, idle load is going to be about 100w and max load for a computer with a 7970 is going to be more like 500w not OCd.
Since the strain at load is more than the strain at idle, it is better to err in keeping the max load value closer to the 50% wattage mark than to err toward keeping idle load closer to the 50% wattage mark.
In this case, the max load is is 77% of stated wattage. That is more than 1 standard deviation away from what is considered a good idea.
All that heat in the case that was getting sucked into the PSU that I mentioned earlier, that would ruin the efficiency to the point that the max load is more like 100% of the PSUs wattage.
In fact, I wouldn't be surprised at all to hear that the PSU in the $1300 PC breaks in a matter of 3 months or 6 months. In fact, I would count on it.
Whoever gets this $1300 PC shouldn't have to pay $100 for a new PSU in 6 months give or take because the PC designer didn't want to spend another $20 on a good case. That is just not doing right by the person who wins.
Not only that, but these articles set the bar for PCs that people like me troubleshoot in the forums on a daily basis. These articles need to show people what a well designed computer looks like and if ill conceived PCs show up in the SBMs then my work (that I am doing for free, btw) is that much harder.
It makes people completely new to computer hardware think that Apevia cases are OK for enthusiast builds and that is not just something you can overlook. Hundreds of gamers might buy that case since it has the SBM stamp of approval and it will likely hurt every one of them to do so.
Not to mention my work is made harder because I can't just direct people to buy what is in the SBM for their budget range (makes my job easier), because I actually care about if those people come back in 6 months.
If someone does come back in 3 or 6 months because of what I advised them to do, that looks bad on me and all of Tom's Hardware.
The only PCs we should be putting in people's hands are ones that will work beautifully until the person wants to upgrade because the computer's performance isn't adequate. That generally means at least 5 years. I guarantee that $1300 PC won't make it anywhere close to 5 years before it has stability problems.
So no, it is not completely satisfactory that a top mount PSU case was selected for this PC. It is not even the tiniest bit satisfactory.
The reason that I suggested that I should make these builds is because I actually care about more than a couple more FPS. I care about the whole end user experience from day 1 to day 1500. Getting a good FPS on day 1 just plain isn't enough to qualify a computer for the SBM in my opinion and I would set the bar a whole lot higher than that. I believe the bar should be set a whole lot higher than that.
Tom's Hardware clearly has the capacity to set the bar higher than that and it owes it to the world at large to do so.
I guarantee you that a committee of addict or above level support staff made up of people who primarily spend their time in the Systems forum would never let a computer like that fly.
Any of us would straighten that PC out before the person bought it if they came in and asked if those parts were OK for a new build they wanted to do.
A committee of 3 of us would never even have to debate over this sort of problem because none of us would even suggest using such a case for a SBM even in jest.
I am honestly kinda sad that I have to discuss this now.
- Edit - Typo