Have been really looking into this and am really thinking of pairing the Sonnet Echo Express SE with AMD HD 7750 in windows 7. Running this on the Macbook Air 11"/i7/8Gb/128Gb.
Reasons for going this route is as follow.
1. I really would like to run World of Warcraft with more options turned up on my dell 30" 3008 WFP. The intel HD 4000 runs at 1080p pretty well on basic raiders settings but it would be nice if I am able to run 2560x1600 with more eye candy turned on, hopefully with this configuration I can at least do "good settings" @ constant 30 fps.
2. Electricity is really expensive in the country I reside. My current electrical bills ranges from 250 to 300 USD. This is considerably low. I don't want to build a gaming rig simply because it takes so much electricity to run a top end machine. The last time I had one I was paying close to 550 USD a month, that was 8 years back and electricity prices have gone up since then.
3. Cost. The Sonnet Echo SE is perhaps the cheapest, neat solution at the moment for an external thunderbolt graphics card. Total cost with an ATI HD 7750 low profile graphic card would be around USD 500. Not only is it cheaper than building a dedicated mid tier gaming rig but also it would probably cost a whole lot less electricity to run.
Here are some concerns I have which hopefully the collective brain trust of MacRumors would be able to help me deal with.
Question 1. The Sonnet Echo Express SE is x8 PCIe 2.0. compared to both the higher end configurations which run at x16 PCIe 2.0. Will this noticeably affect performance considering that the total throughput of thunderbolt is closer to x4 PCIe.
Question 2. The AMD HD 7750 low profile card has a peak power consumption of about 42 watts, The Sonnet Echo Express SE has an external power supply of about 60 watts. Does this means that 18 watts will be wasted. Is there anyway I could "save" that power.
Question 3. Seeing that this is an external power supply, would I be able to switch to a more power one in future should the need arise.
I do hope to get near about the same graphical performance as the Retina display macbook pro. After all the AMD Radeon HD 7750 low profile is a discrete desktop card compared to the nvidia 650m mobile card in the macbook pro.
p.s. I am a complete hardware nub so any help will be appreciated, thanks in advance.
Link to the Sonnet Echo Express SE
http://www.sonnettech.com/product/echoexpressse.html
Link to HD 7750 low profile
http://www.techpowerup.com/reviews/Club_3D/HD_7750_Low_Profile/23.html