All of the e3 Xeons are rebadged i7s except for the 1220 and 1225 which are rebadged i5s.
The e3 Xeons ARE great for gaming.
The 1230v3, 1240v3, 1245v3, 1270v3, 1275v3, i7-4770, i7-4771, and i7-4770k are all variations of the EXACT same chip.
The i7s and the e3s ending in '5' all have integrated graphics, the e3s ending in '0' do not. The Xeons have a few more instruction sets the i7s don't. The i7-4770k is the only one that can be overclocked.
The only other difference is clock speed and TDP.
The 1230v3 is rated @ 3.3/3.7ghz and is 80w
The 1240v3 is rated @ 3.4/3.8ghz and is 80w
The 1245v3 is rated @ 3.4/3.8ghz and is 84w
The 1270v3 is rated @ 3.5/3.9ghz and is 80w
The 1275v3 is rated @ 3.5/3.9ghz and is 84w
The i7-4770 is rated @ 3.4/3.9ghz and is 84w
The i7-4771 is rated @ 3.5/3.9ghz and is 84w
The i7-4770k is rated @ 3.5/3.9ghz and is 84w
The important thing is they are all essentially the same. Xeons are not just for servers. They can use the same LGA1150 motherboards i3s, i5s, and i7s use. The are great for gaming, rendering, editing, graphic design and everything else. The e3-1230v3 in particular is an awesome deal since it is so much cheaper than the i7-4770. That's why you see many of us constantly recommending it on here for people who don't wish to overclock.
One more thing to remember, the e3-12xxv3 are all Haswell and use the LGA1150 socket. The e3-12xxv2 are all Ivy Bridge and use the LGA1155 socket. And then the regular e3-12xx are older Sandy bridge and also use the LGA1155 socket.