jimmysmitty
Champion
Vogner16 :
jimmysmitty :
Vogner16 :
I have to agree with jimmy here. we are simply too far out to know where the final performance will lie. all we really have to work with are rumored uArch and AMD's lofty claim of 40% IPC improvement. we still don't know what clocks AMD is capable of here! that's basically the biggest part of this isn't it?
hell if they hit 6 GHz or something absurd then your worries of small pipeline are irrelevant.
still speculation is fun 😛
hell if they hit 6 GHz or something absurd then your worries of small pipeline are irrelevant.
still speculation is fun 😛
The problem with a smaller pipelin can be seen with Intels Netburst and AMDs BD uArchs. While they can hit absurdly high clock rates (the Pentium 4 topped out at 4GHz stock clocks well before the Core i did) they have such low IPC that it is almost a bad trade off. Core 2 came in and the 2.4GHz E6600 was pounding the higher clocked Pentium 4s. That was die to the wider pipeline but also a much more efficient design overall.
BD is in that same bucket right now. You can get a 5GHz FX CPU yet a stock i5/i7 beats it in most situations at a much lower clock speed.
The change they are making right now will for sure increase performance over Excavator, they are going back to a core design similar to K10 but adding SMT and improvements, but how much depends on a lot of factors and as with anything most companies use situational performance to tell us what it should be and until we know that we can only assume that 40% is one of many things.
As for clock speeds, the info right now points towards 3.5-4GHz much like Intel. I highly doubt that GF has a mature enough 14nm yet to do much higher clock speeds than that or to even match Intel. That we will have to wait and see.
Personally I think the increase is including the SMT cores and not a per core per clock increase. But that is just my opinion.
which is what I was getting at. despite the small pipeline amd matched ivy and sandy perf $ for $. amd claims 40% more ipc than excavator and lets say we only get 30% over piledriver (worst case scenario) if we take that info of 3.5 to 4 (stock, I overclock and assume everyone else here does as well so could we assume 4.5 effective?) puts us with a overclocked skylake clock to clock speed. only diff is in the IPC. and from what it looks like 30% over piledriver should get us there!
I see all arrows point to matching intel performance i7's closely and with pricing expected to be around a K series i5, we have a good chip on hand! Whats not to like about this? nobody expects it to be faster than intels i7, but nobody expects it to cost that much either so $ for $ we have another win to me. there is a reason I built 2 8350 computers and its because im cheap. not for top end perf. that title changes to a new cpu every year.
BD originally did not match Intel $ per $ if you consider the performance. The FX 9000 series launched at a top end price of $1000 and it wasn't even close to stock i7 performance.
If Zen performs at the level of the i7s it will not be priced at the i5 range. It will be priced based on the actual performance level it has. The Athlon 64 is a great example of this. It was priced equal to and in some case higher than an Intel chip and did not drop until a few months after the Core 2 series arrived.
And I have nothing against AMD. I wouldn't buy one right now for my system nor my wifes, although I did buy a Phenom II 965 for hers, but I do not like their southbridge. Their SATA performance is not as good as Intels, just upgraded my wife to a Samsung 850 Evo and it has a loss of about 20% in IOPS. Maybe that will change with Zen, it better because their current chipset is ancient compared to Intels.