hopefully we can see a 25% increase. I'd hope we see better than 2.88 pts though, hopefully we can see around 3 pts. with the 5200U.
That's unlikely, because the max dual core Turbo is only 2.5GHz. You'll need the 5300U. See though the 4300U's successor is 5300U, so there you go. 4300U is technically a business part anyway. Base frequency really matters on a CPU, but not so much for GPU. I wonder why they upped it at Broadwell.
The 4200U still achieved 2.5 pts, so not exactly a standstill, but a 5% improvement is nothing to cheer about.
3317U came at Ivy Bridge's introduction. They released 3337U with 100MHz higher clocks later. And it wasn't a business oriented part like the 4300U. That practically puts it on par with 4200U. Ok, maybe you didn't know and I didn't mention that.
Perhaps that's a little too optimistic.
That's still very good, if they moved from requiring 28W for 2+3 part in Haswell to 15W 2+3 part, and 28W 2+3e part. I mean, the CPU is faster too. You are talking 3.9 points on a dual core part. That's why the -M series SKUs are gone. I figure though it might be a typo and 2+3 parts are really 28W and 2+3e parts are 35/45W parts only for desktops and special mobiles.
15W TDP ''U'' chips with Iris Pro should arrive with
Skylake.
The biggest reason not having the eDRAM on the 15W and lower parts is because the current eDRAM modules would take up lot of TDP. 3.5-4.5W for the eDRAM on current Crystalwell parts are massive 1/3rd of the TDP level, while is relatively insignificant for a 28W part. The eDRAM presentation this year reduces standby power to 1/5-1/4th but they said nothing about peak power.
Also, the eDRAM takes quite a lot of space too and U/Y series have not much room if at all:
http://hothardware.com/articleimages/Item2219/IntelBroadwell-600.jpg
If they move the PCH to 22nm on Skylake then they can probably integrate the eDRAM and put high bandwidth connection between the two chips. Hilariously that would mean the U parts would have faster connections than the DMI successors on the high end desktop/laptop parts though.
(One last PiP(posts in posts) I promise)
although the low clock speed is puzzling.
The GPU? If you look at benches in Notebookcheck, the HD 4400 chips really aren't running higher than 1GHz in any meaningful game. Now if Intel engineers figure out that setting it to 1GHz benefits it in some way that's good enough for me.