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i am really surprised you went from the 2700k to 3770k and then to the 4790k. if you had kept that 2700K you could still be running it now!My favourite three are,
Athlon 64 x2 4800 (Toledo). Very fast chip for it's time and cost a fortune, think I paid £500 to £600 for it. I used that chip until I had the Q6600 GO in Sep 2008 so I got my monies worth out of it. I used the MSI K8N Neo4 Platinum board with this chip, 24/7 use and never had an issue.
Q6600 GO, only paid £112 for it from here in Sep 2008, blew the Athlon 64 x2 away and for such a cheap price. Used that until Apr 2012, certainly got my money worth out of that chip, one of Intel's best chips and it will always be my number one favourite. Only board used with this one was the DFI LANPARTY DK X48-T2RS, again not a single issue with this setup either with 24/7 use.
My current favourite is the 4790k I'm using now, fast and cool, think this will be second favourite after the Q6600.
Here are the CPU's I have owned in order, if I can remember them.
Cyrix 233+ (188Mhz) - My first PC (prebuilt in 1998/99) what a slow piece of crap
Pentium 2 266Mhz (second hand prebuilt PC)
AMD Duron 800Mhz
AMD Duron 1.3Ghz
Athlon XP 2100+
Athlon XP 2500+
Athlon XP 2600+
Athlon 64 3200+
Athlon 64 X2 4800+ (last AMD chip I owned)
Intel Q6600 GO
2700K
3770K - My least favourite Intel chip, even with a Noctua D14 and at stock speeds it was a hot chip, with extremely uneven core temps.
4790K - This one in comparison runs much cooler at idle and load than the 3770K (same heatsink and case) plus I get a 500Mhz speed bump.
i am really surprised you went from the 2700k to 3770k and then to the 4790k. if you had kept that 2700K you could still be running it now!
In my own book the real legends of the last decade, looking at the overall package are E6600, Q6600, i7 920.