Scali wrote:Why are you comparing to Intel?
I was specifically talking about their '51% IPC' remark, which was a comparison with Bulldozer/P […]
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SPBHM wrote:they ignored clockspeed you say, yet they are able to release a CPU with 3.6GHz base and boost up to 4GHz within a 95W TDP, while Intel's 8c alternative is clocked lower (and costs 2x)
Why are you comparing to Intel?
I was specifically talking about their '51% IPC' remark, which was a comparison with Bulldozer/Piledriver. And Bulldozer runs at way more than 3.6-4 GHz. They go up to a base clock of 4.7 GHz and a turbo of 5 GHz. It was designed for higher clockspeeds at the cost of IPC, so the comparison is very skewed.
SPBHM wrote:yes C2D IPC gain was far greater, but, I think the improvements are overall harder to achieve nowadays (look at Intel incremental approach), and we are talking about AMD
Yes, we are talking about AMD.
AMD actually took a step *back* in terms of IPC with the Bulldozer. So for them it was VERY easy to get IPC gains. In fact, they could just have re-released the Barcelona, and boast about IPC gains.
the original FX was also released at 3.6GHz max, the 4.7GHz one is a CPU with a 220W TDP released 3 years later (when the process/architecture had matured quite a bit), do you really think that's a relevant part? in any case the performance is low even compared with the 65W Ryzen (1700).
the fastest FX with the same TDP as the R7 1800x have a 3.3GHz clock (FX 8370E) and half the amount of full cores and threads,
and AMD typically was quick to start improving what they had, I think they are going to improve how they handle the 14nm process and improve the Ryzen architecture fairly well over the next few years.
not so easy, they released several revisions of Bulldozer with some IPC gains, but nothing like 50%, it took an entirely new design and 4 years,
the high clocked FXs from 2012+ with 125W TDP were all around 4GHz(turbo around 4.2), Ryzen starting it's life at 3.6GHz(turbo around 4) is positive I think, the sacrifice in clock doesn't look to significant when you add the IPC gain.
also, the 52% gain is over newer revisions of Bulldozer, not the 2011 one
http://i.imgur.com/zavUwMV.jpg