- Jun 15, 2022
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I generally consider replacing the CPU to be pointless, especially if it has the penultimate generation of top-end Ryzen / Core. In each generation of new CPUs, we get only a small increase in performance, Moore's law is dead, and even more so, as you said, the main work is done by GPUs. It would be an extra expense for no purpose.While it's true they do have a slightly higher max TDP, the hardware requirements for the 4090 are the same as a 3090FE card. If he's got his stuff set up to handle 8 machines already, he's going to be fine even if he replaces all the cards. Yank the old, drop in the new, update your drivers, and off you go.
As far as the "investment cost", he's bringing in at least $10,000 USD/month (assuming bare minimums for pledges). Let's assume for whatever reason he's got an exceptionally expensive monthly cost of living (due to electricity usage) and call that 1500/mo. Okay, that brings our minimum down to 8500. The Zotac 4090 Trinity is going for roughly (allowing for Euro to USD conversion) $1,940 each.
Granted, I don't know his income taxation rate, but regardless of what it is, I would wager he's got a fair amount of money banked up to cover emergencies or other 'needs' (like future hardware replacement). Let's round the cost up to an even $2,000 each. If he's truly using 8 machines full-time, that's a $16,000 upgrade cost, which absolutely sounds painful, but that still falls under 2 months worth of income for him (at minimum) after you've already deducted estimated living expenses.
In the US, that would be $16k of business expense writeoffs, on top of whatever he got in credit for the 3090s, which he can now sell to recoup some money. He could probably offload them for $1,000 each and watch them disappear over night, just to get the junk out of his home/workspace, and in the big picture, it has barely made a dent in his net profits, and now he can produce a hell of a lot more. Maybe he'll only start with 4 cards, and do some in-house side-by-side becnhmarking, to decide if he can instead scale-down how many computers he's using at once because of the performance gains.
One way or another, I expect he'll be looking to replace every 3090 card he's using, either in all in the machines, or in the machines he intends to keep, before dismantling/repurposing the other ones. Unless he takes it a step further and decides to build all-new workstations from the ground up with better processors and such as well, but that's a bit extreme when your GPU is doing all the heavy lifting.
I still have the old Haswell gen Core i5, it's only 4/4 and it handles most tasks, even modern games.