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Thanks for the post MystPhysX. I would definitely go for the same setup as you if I where to build an eGPU. Thing is, the setup is not as cheap as I hoped it would be and the performance isn't all that good either (30% loss on HD7950). I think I'm better off building a separate machine. Better bang for buck and future-proof.

I already have the rMBP (I have been waiting for a Thunderbolt eGPU for a year now. Tired of waiting on Lucid, MSI and I guess SilverStone will wait for the next-gen of Thunderbolts). So you recommend getting the OWC Helios (405 USD incl shipping) + Cable + PSU + Setup Tool. Using bootcamp would be awesome and the PCI extender mod you linked looks easy enough. However there must be something extra, right? I cant just expect this to run out of the box, can I? Would that support a GTX760 if I removed the case? Thanks for helping! EDIT: I assume the Echo Express Pro gives the same performance as the SE/Helios except size/PSU. This benchmark is interesting: Echo Express Pro: Desktop Graphics In A Thunderbolt Chassis - Powerful Add-In Cards...Over Thunderbolt? Is buying a GTX760 a bad idea due to thunderbolt's max bandwith?

I want to build a eGPU for my rMBP 2012 15". In this thread I want to plan my purchases, hoping for your input. I've many threads on Thunderbolts and I came to the conclusion that the [Sonnet Echo Pro TB Adapter + ViDock]-combination the easiest way is. (As shown @ Get an external graphics card on your ultrabook through Thunderbolt). I would buy this setup if I had 100% confirmation that this would work out of the box, but I don't. Expensive [easy?] Sonnet Echo Pro TB Adapter + Apple Cable + ViDock ViDock 4 Plus Overdrive $279 + $30 http://www.villageinstruments.com/tiki-index.php?page=ViDock Sonnet Echo Pro £146.34 + £5.13 http://www.amazon.co.uk/Sonnet-Echo-ExpressCard-Thunderbolt-Adapter/dp/B0080MQJJ6/ref=sr_ob_3?s=computers&ie=UTF8&qid=1373971018&sr=1-3 Apple Thunderbolt Cable £38.95 http://www.amazon.co.uk/Apple-Thunderbolt-cable-mini-DisplayPort-mini-Dis/dp/B0058KHRPS/ref=pd_bxgy_computers_text_y Total 600 USD Total 450 EUR Total 390 GBP I could also add an extra ~50 GBP and just build a complete new system capable of running a GTX 760 like this one: Intel Core i5-4430 - System Build - PCPartPicker United Kingdom (433 GBP). In my opinion the Sonnet+ViDock combo is not worth it. Using a P4EL (60 USD) + PSU (45 USD) would save me 174 USD. Using a cheaper TB cable could also save 40 USD, but I'm not sure if they have the same capabilities. Cheap [hard?] Sonnet Echo Pro TB Adapter + Cheap cable + P4EL P4EL $60 + $21 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=171077040229&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en Sonnet Echo Pro £146.34 + £5.13 http://www.amazon.co.uk/Sonnet-Echo-ExpressCard-Thunderbolt-Adapter/dp/B0080MQJJ6/ref=sr_ob_3?s=computers&ie=UTF8&qid=1373971018&sr=1-3 Cheap Thunderbolt Cable £11.36 + £5.03 http://www.amazon.co.uk/Startech-Male-Mini-DisplayPort-Cable/dp/B006LL56J2/ref=sr_1_73?s=computers&ie=UTF8&qid=1374870440&sr=1-73 Total 339 USD Total 255 EUR Total 220 GBP I'm really interested in the Cheap list above. My only concern is that even with Tech Inferno Fan's Setup tool I'll be unable to get it running due to my low knowledge on windows boot stuff. (Tutorial?) I also have no clue what the speeds (x.xOpt = ???) and bottlenecks are, and what GPU's are supported. (The most powerful GPU I see used is the 660 but at this moment the 760 and 770 are more interesting.) Thanks! I'm sorry if this post makes me look like an idiot not reading up on the subject first, If I missed something please let me know.