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Join Date: Mar 2012
Location: Washington State
I don't think they're a bad buy necessarily, if you like to tweak your computer to get the last 1% of performance the XTs seem like the CPU for you. Performance/dollar value, yeah stay away from the XTs...
I don't believe AMD for a second on "refined process" the way they are selling it, or at least, the way people are interpreting it. I think AMD updated the oxide layer thickness to survive extra voltage for longer and used the strong CCD bin equivalent from a 3900x (CCD 1) for 3600XTs, here's why:
My mid-November manufactured 3900x (a fairly good 3900x sample) vs mid-April manufactured 3600xt (a very average sample from what I can tell).
3600xt max stable single core boosting - 4727
3900x max stable single core boosting - 4747
The boost algorithm is holding it at max speed more consistently, so for a given speed reported in software, the XT scores slightly higher than the X (5 points in R20, 1 point in R15), but the 3900x hits higher speeds ultimately and they score the same single core.
3900x static OC - 4400 @ 1.3 GET (CCD 2 limited)
3600xt static OC - 4520 @ 1.32 GET
Both hit a voltage wall at 4550 requiring north of 1.42v. They will both reach 4600, but it takes far too much voltage to stabilize safely.
Sure seems like they took a single (stronger) CCD from a 3900x slapped into a 3600xt and added a tweaked boost algorithm.
The updated boosting algorithm used on the XTs boosts like using PBO does on a 3900x.
3900x unlimited PBO limits - 4350mhz @ 1.337 GET during R20
3600xt stock - 4325mhz @ 1.37 GET during R20
3900x FIT limit in P95 - 1.27
3600XT FIT limit in P95 - 1.325
Certainly seems more like they are throwing voltage at the problem to get it to boost higher during all core work, and using a slightly better bin to ensure the single core boost is stable higher up (the 3600xt does 4600 single core at all default settings). This is also possibly why the 3800xt and 3900xt don't come with a cooler, the extra voltage may (probably imho) overwhelm the Wraith and cause performance fall off.
Last edited by tcclaviger; 07-22-2020 at 10:41 PM.