Except for those who have a top tier power supply from a custom built machine, an R9 270 would be a really dumb card to recommend. Which is to say, it's a poor choice for 95% of the folks out there. For those who buy their machines from Best Buy, Frys, etc as a pre-built HP / Dell / Lenovo / Asus / Acer etc - the 750 / 750 Ti is by far the best game in town.
Why? Because those systems typically have 350 - 450W power supplies. A 750 or 750 Ti doesn't even need a special power connector, with TDP of 55-80W it can run off the PCI-E bus. An r9 270 runs 150-180W TDP, and most sound like a vacuum cleaner. I would never recommend anyone outside a hardcore enthusiast have something like that in their HP / Dell / Lenovo etc PC. It's just asking for it to become unstable.
So much incorrect information in 1 post:
1) TDP does not equal power consumption. An R9 270 averages about 111W in games and peaks at 121W:
http://www.techpowerup.com/mobile/reviews/ASUS/R9_270_Direct_Cu_II_OC/24.html
You can easily run it on a BestBuy system with a 300-350W PSU. You also made a point of needing a top tier 450W to run an R9 270, while in reality a TOP tier 450W will run an i5/7 paired with a 7970Ghz/780/R9 290. You really need to learn what TDP is and how high end PSUs are rated.
Even the R9
270X averages 122W in games and peaks at 135W:
http://www.techpowerup.com/mobile/reviews/MSI/R9_270X_Gaming/22.html
Your stated 150-180W power usage implication is more in line with an R9 280/7950, not a 270 class card.
2) You said an R9 270 sounds like a vacuum cleaner. Really? I would love to buy a vacuum cleaner that runs 35dBA at full load:
http://www.techpowerup.com/mobile/reviews/ASUS/R9_270_Direct_Cu_II_OC/25.html
Your post is ignorant since it implies almost all R9 270 series are loud. Why can't a gamer buy an MSI Gaming R9 270X, 27dBA at full load, quieter than the MSI Gaming 970 - which itself is one of the quietest cards ever made! Most 270 after-market cards are actually cool and quiet.
http://www.techpowerup.com/mobile/reviews/MSI/R9_270X_Gaming/23.html
3) You flat out ignored the vast performance difference with the 750Ti by simply discounting R9 270/270X based on factors you just made up/what you thought was correct info. Now that we know the facts that 270/270X run cool and quiet and don't use anywhere near the amount of power you quoted, how do they stack up against the 750Ti?
R9 270 is 31% faster and R9 270X is 44% faster at 1080p:
http://www.computerbase.de/2014-09/...vidia/6/#diagramm-rating-1920-1080-4xaa-16xaf
Considering gamers pay $550 over $330 970 and $280 290X for just 15-20% more performance, R9 270/270X represent a tremendous value as regular sub-$150 cards compared to the 750Ti. A 750Ti is a great buy at $80-85, but at $120-150, it's total garbage.
Even in older reviews which don't account for frequent sales and rebates, the R9 265 is faster than the 750Ti, and chosen as the superior gaming card at $150. But now 270/270X can be found for $100-150 so frequently that if one really wants the best sub-$150 gaming card, it's easy to find them at these prices.
"This makes the R7 265 the only viable option from AMD in the $150-$200 territory, but that's okay because it's 13% faster than the GTX 750 Ti at same price, making AMD's card an obvious choice."
http://www.techspot.com/guides/912-best-graphics-cards-2014/page7.html
Your post is the reason NV continues to have nearly 70% market share - average PC consumers don't do enough good research, most of these consumers believe what they hear from someone on the Internet or in real life like your made up noise and power usage characteristics of R9 270 series, and in the end get 30-40% less performance with NV, while truly believing they got a good deal/card!
Your post also highlights another major point of people who for 5-10 years will keep paying huge price premiums for slow low power cards -- their reluctance to spend $26-35 on a new PSU:
EVGA 750W for $33:
http://slickdeals.net/f/7535806-evg...ular-power-supply-33ar-promo-code-fs-frys?v=1
XFX 550W for $26:
http://slickdeals.net/f/7529716-xfx...550sxxb9-25-99-after-rebate-free-shipping?v=1
Thermaltake 650W for $30:
http://slickdeals.net/f/7530706-the...-after-price-match-and-rebate-microcenter?v=1
It's no wonder that so many people on our forums think the average NV gamer is an uninformed consumer when they can't do/don't bother to do proper research and can't even think outside the box when it comes to buying a good $35 PSU but have no problems paying $130-150 for lower power cards - NV marketing FTW!
It's not surprising that NV will get a ton of sales with the 960 from the same customer pool that eats NV brand marketing and perf/watt for breakfast. I can already imagine people posting on forums all over the net that you need a 700-850W PSU to run an R9 290 because "insert AMD/AIB recommends it." Reminds me of the days when people were dumb enough believe that you needed a high quality 480W to run a 6800Ultra.