hello. i'm a dual processor mac pro 5,1 newbie so if i say something stupid or that doesn't make sense, let me know. so i'm looking at the Westmere-EP CPUs on wikipedia and i cannot decide on what CPU i want to get. according to my simple minded math, the 6 core CPUs give you the most performance/wattage. based on looking at the TDP, core count, and clock speeds, i've narrowed down my selection to the following: L5640, x5675, x5680. these are also in order from cheapest to most expensive when buying them used on ebay, and also their clock speeds. i've read that classic mac pros have very high wattage use when idle and i don't want to pay the high electricity bill for years to come. when it comes to the x5675 or the x5680, it seems that the x5675 gets better performance/wattage and is slightly cheaper, but what i want to know is how much wattage is being used when the CPUs are idle. also, does web browsing or watching youtube videos count as idle? the question i have about the L5640 is whether this CPU will have significantly lower idle watts than the x5675/x5680 CPUs. 90% of the time, my mac pro will not be in heavy usage but i don't want to compromise on my performance unless if the L5640 has significantly better idle watts.
now that i'm on the subject of watt usage, is there anything else i can do to lower the watts? should i unplug the dvd drive since i never use it? i also plan on upgrading my GT 120 to an RX 560 since i need more GPU power as well. will the RX 560 have lower watt usage when at low level usage?
i know that getting a new computer is an option but i want to hold that off for a few more years