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salgado18 :
So you can throw away the lame i5 and buy a monster 18-core cpu, without replacing an expensive motherboard and 4 sticks of fast ram.
If you are going to spend $700+ on a HEDT platform (CPU+MoBo+RAM), I doubt you are on such a tight budget that you cannot afford the extra $50-120 for a CPU capable of making proper use of the board. The HEDT market isn't for people who are desperately pinching pennies. Also, if you get a CPU that can only use half of the motherboard's features, you won't know if your motherboard has defects in those unusable features until you upgrade the CPU. Finding out that your motherboard has a dead DIMM or PCIe slot after the warranty has expired and you spent another $600+ on a new CPU to put on it would suck.
That's not a strategy for the HEDT market, that's for enthusiasts and professionals on a tight budget. Squeeze the wallet to invest in a good platform, get two sticks of ram and a cheap i5, then save up some more and upgrade to 12+ cores and get another two sticks. Start using the pc right away, and get performance later. I've done it, it kind of works, especially when you cannot guarantee when you will have the money for the upgrade.
About defects, in my country at least, that's a hidden vice as they call. Even after the warranty, if you can prove the product had a manufacturing defect that you only discovered now, you are eligible for free repairs or money back or whatever. But then, imagine you upgrade, two or three years later you buy an M.2 drive and then find out the slot doesn't work. Should have bought an M.2 drive from the start, maybe? And the other slots and features? You can't purchase something expecting it to be defective.