So it's Bonaire, 14 CU. And the eSRAM has a much complex layout than what we speculated.
It's funny that we get so much insight in the working of the console and it's design only because the technical team was so pissed off to the internet haters .
Xbox One (Durango) Technical hardware investigation
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So it's Bonaire, 14 CU. And the eSRAM has a much complex layout than what we speculated.
It's funny that we get so much insight in the working of the console and it's design only because the technical team was so pissed off to the internet haters .
Billy Idol
Legend
So astrograds occasional 7/8 theory was right after all?
Very good read. And I appreciate that MS is so open about their system...nice for us.
Very good read. And I appreciate that MS is so open about their system...nice for us.
No, astrograd thought it was a quantum effect. MS says you can just take advantage of access patterns. It also mean the 204GB figure is basically a never thing.
Theyre saying that any memory subsystem is never utilized 100%, not just theirs, so apply the same math across the board to all systems' memory.
Also, I'm not clear on if the box enabled the 14 CUs or they're there but they went with the upclock only. Sounds like just the upclock but then say that sony has 4 more CUs instead of 6.
Betanumerical
Veteran
Of course no system is 100% effiencent but most reach far closer to there peak then the eSRAM numbers demonstrate.
They say 2 remain disabled for redundancy. PS4 probably physically has between 20 and 22 CUs with some disabled for redundancy as well. They conveniently omit the cost portion of the cost/benefit analysis they describe when choosing between using all 14 CUs or going for a slight upclock.
If I'm understanding the article correctly, the peak bw number is for both read and write however individually you're capped at 109GB/s which suggest that to the degree you can balance out read and write the higher your aggregate b/w goes.
They cite 140 to 150GB/s as realistic targets but again you never do either activity at anything close to that speed. Perhaps its not too difficult to optimize but its not as straight forward as other design options either. Balance seems to be the key to their approach but I'd also say its fair to question how often you'll be b/w limited due to only being able to read (or write) at 109GB/s....
They cite 140 to 150GB/s as realistic targets but again you never do either activity at anything close to that speed. Perhaps its not too difficult to optimize but its not as straight forward as other design options either. Balance seems to be the key to their approach but I'd also say its fair to question how often you'll be b/w limited due to only being able to read (or write) at 109GB/s....
So from what I gather:
1) There's a crossbar in front of both DRAM and SRAM
2) You can page across both pools
3) eSRAM is banked, real life bw from 109GBps to ~150GBps
4) SI based GPU, 2 CUs disabled for yield
5) Claim raising 6% clock beats 2 additional CUs
6) Suggest compute on GPU will benefit from lower latency
7) Dynamic resolution HW scaler
1) There's a crossbar in front of both DRAM and SRAM
2) You can page across both pools
3) eSRAM is banked, real life bw from 109GBps to ~150GBps
4) SI based GPU, 2 CUs disabled for yield
5) Claim raising 6% clock beats 2 additional CUs
6) Suggest compute on GPU will benefit from lower latency
7) Dynamic resolution HW scaler
Betanumerical
Veteran
Yep, for number 4 it looks nearly certain its based on the HD7790 its identical sans the memory controllers.
Didn't Cerny debunk this?
Except it lacks the 7790's additional ACEs. And how many redundant CUs does the 7790 have disabled? Neither console is based directly on any discrete part from AMD.
Betanumerical
Veteran
The 7790 has 14CU's, disabling 2 brings you to 12CU's, it has the same amount of TMU's and ROPs. Its pretty damn close.
Michellstar
Regular
"Just like our friends we're based on the Sea Islands family"
Bonaire vindicated finally XD
Bonaire vindicated finally XD
Let's have sense not to use MS engineers to provide understanding of PS4. Their comparisons are immaterial. The thing that matters is what their design is for their hardware as told by the people that made it. We then get Sony's design from Sony, and do the comparing ourselves without obvious bias towards the design that we made, which obviously the respective engineers will have (you won't get either side saying of the rival design, "gosh, that's agood idea. Wish we thought of that." )
)No, 7790 cards are sold with 14 active CUs. We don't know how many the GPU physically has. I'd wager it's probably 16.
I'd also add:
8) CPU bump important for maintaining stable real world framerates
9) New buffer formats
D
Deleted member 11852
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Yes and no. Cerny debunked the speculation that 14 CUs were dedicated to graphics and 4 were dedicated to GPGPU but Cerny's comments lend some credence that the PS4's balance is 14 CUs for graphics. Sony are banking on GPGPU being big in a few years and don't want developers to have to scale back graphics to free up CUs to the GPGPU work.
Obviously Microsoft believe GPGPU will get more use (hence, the "overhead") but less so than Sony. Only time will tell.
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