4 ms·

Who would possibly believe that 85% IPC increase is on the table for silicon without a wafer sized die?

noir_lord 6y ago
No-one but (hypothetically) Intel putting a rumour out like that might make people thinking of switching to AMD to hold-off and see. If I was been cynical.
- ksec 6y ago
  Well there is 25% from Willow Cove to Skylake, so you are looking at 20% increase from Willow Cove to Golden Cove, and another 20% from Golden Cove to Ocean Cove. Not entirely impossible. Given some of these improvement has been sitting within Intel for years due to the delay in 10nm.
  - noir_lord 6y ago
    Not impossible, we are a long way from computronium but I'll believe it when I see it in independent benchmarks.
Veedrac 6y ago
Apple already has an ~80% IPC lead over Intel. So, me.
- willis936 6y ago
  Gonna need some heavy sources on that one. I can make an ALU in an FPGA that only takes in one bit data and adds it. That would take the IPC crown. Is it a useful statement? No. Comparing ARM IPC to x86 IPC is far more complicated than measuring length.
  - Veedrac 6y ago
    See SPECint2006 in [1] (ctrl-f “absolute performance”). SPECfp is maybe more like a 60% IPC lead, but less relevant to typical users. I've taken some measurements of the A13's microarchitecture (mostly, its ROB size), and Apple has a bigger lead here than you'd expect. I don't want to share his data without permission, but the bulk of the code is at [2] and I'd be happy to help anyone able to run code on an iDevice repeat the same measurements. [1] https://www.anandtech.com/show/14892/the-apple-iphone-11-pro-and-max-review/4 https://www.anandtech.com/show/14892/the-apple-iphone-11-pro... [2] https://github.com/Veedrac/microarchitecturometer https://github.com/Veedrac/microarchitecturometer
    - Veedrac 6y ago
      Sorry, I meant to say “I've taken some measurements of the A13's microarchitecture (mostly, its ROB size) with Andrei Frumusanu from AnandTech”.

No-one but (hypothetically) Intel putting a rumour out like that might make people thinking of switching to AMD to hold-off and see. If I was been cynical.

ksec 6y ago
Well there is 25% from Willow Cove to Skylake, so you are looking at 20% increase from Willow Cove to Golden Cove, and another 20% from Golden Cove to Ocean Cove. Not entirely impossible. Given some of these improvement has been sitting within Intel for years due to the delay in 10nm.
- noir_lord 6y ago
  Not impossible, we are a long way from computronium but I'll believe it when I see it in independent benchmarks.

Veedrac 6y ago

Apple already has an ~80% IPC lead over Intel. So, me.

willis936 6y ago
Gonna need some heavy sources on that one. I can make an ALU in an FPGA that only takes in one bit data and adds it. That would take the IPC crown. Is it a useful statement? No. Comparing ARM IPC to x86 IPC is far more complicated than measuring length.
- Veedrac 6y ago
  See SPECint2006 in [1] (ctrl-f “absolute performance”). SPECfp is maybe more like a 60% IPC lead, but less relevant to typical users. I've taken some measurements of the A13's microarchitecture (mostly, its ROB size), and Apple has a bigger lead here than you'd expect. I don't want to share his data without permission, but the bulk of the code is at [2] and I'd be happy to help anyone able to run code on an iDevice repeat the same measurements. [1] https://www.anandtech.com/show/14892/the-apple-iphone-11-pro-and-max-review/4 https://www.anandtech.com/show/14892/the-apple-iphone-11-pro... [2] https://github.com/Veedrac/microarchitecturometer https://github.com/Veedrac/microarchitecturometer
  - Veedrac 6y ago
    Sorry, I meant to say “I've taken some measurements of the A13's microarchitecture (mostly, its ROB size) with Andrei Frumusanu from AnandTech”.