PlayStation 4 (codename Orbis) technical hardware investigation (news and rumours)

Probably a string of them timed. If you don't need them to be really bright LED lights are fairly cheap and miniature in small numbers.

 

One LED in the proper housing can create the effect seen with a gradual turn on in brightness. You don't need to have multiple LEDs.

 

Sorry, I thought the LED "flowed". I just looked up a few videos and found that it didn't. Ya it could be done with one with some control to the brightness.

Blame Asia for not allowing me to get one on my hands yet!

 

Do you mean the pulsing effect (like when you turn the machine on or off), or the light intensity gradient?

The pulsing is done with pulse code modulation of the supply voltage to the LEDs, and the gradient is due to the light guide being smoky-colored plastic.

 

It could be an optical delusion, but it looks to me as gradient is moving when LED is pulsing.

 

And that's what you get for using PC hardware. Could have told you that back in 2006

 

How's that VR thing coming along ?

And Gaikai ?

 

Found on gaf

 

L2 is a standard component of the Jaguar modules that are in both consoles so it will certainly be present in the PS4 also.

 

Being discussed here.

About the only thing I think it points to regards PS4 is that it seems 7 cores are available compared to XB1's six cores (14 MB/s versus 12 MB/s. Detailed discussion in the above thread).

 

Project Cars Dev also talks about having to copy mem to Garlic mem, I think this is to maximize bandwidth usage of the GPU, the garlic mem is not coherent with CPU caches so GPU can read mem at the max bandwidth available.

Here: http://gamingbolt.com/project-cars-...splitting-renderer-across-threads-challenging

Don't know about the final verdict on PS4 having HSA. but it worries me that they have to shuffle memory around. Well, "worry" is an over statement but I was expecting more ..

I never had to program a language where I had to allocate mem, just a JS hobbyist here, so can someone explain why they have to shuffle things around?

Since they are working on a unified pool of RAM, can't they re-assign a certain fragment of memory as "garlic"? I mean, let the CPU do its thing, write back to RAM, declare that portion of memory as "garlic mem", and have the GPU read at full speed? Since there's ample amount of RAM available, can they "double buffer" this and have the GPU work on Garlic while the CPU is hammering another portion of that mem for the next frame? Or is this probably what they are doing and complaining about? Can't understand what the following means:

I don't know that that LCUE is Is the "memory copying" they mention just the CPU writing results back to RAM, or are they copying onion mem to garlic? Is re-assigning a mem portion as garlic/onion very costly, costly enough that copying data between two "pools" is cheaper?

Can somebody enlighten this poor soul?

 

Until someone more knowledgeable than me replies, I'll just say that the cache-coherent bus is there to reduce latency. Instead of the GPU having to go all the way out to main RAM to get access to some recently CPU-used data, it's in cache and immediately to hand. If the data you want isn't in the caches as its conventional data in RAM, you want to bypass this bus. Of course, whatever data the CPU holds in cache is data also being written to RAM, and the GPU can access the same data from RAM instead of from the cache which might be what they're talking about regards the copy, although I'm very uncertain about this and quite probably wrong.

 

You might as well link to the original article so people have a better idea of the context.

 

There's an interview with à Ubisoft dec Who discussies this on Eurogamer, published somewhere early summer I think.

 

Their code was/is using threads poorly. Today in 2013. Of course single core of i7 is faster than jaguars one, doh! I wouldn't expect some technology magic from such devs.

 

It was quoted in the pjbliverpools quote, sorry:
http://gamingbolt.com/project-cars-...splitting-renderer-across-threads-challenging

 

thuway assures ps4 sold 245-248k during second week of December in USA.

 

Who? The benchmark coders? If the point of the benchmark is to measure performance of one single core then it's obviously not poor multithreading to not use more than one core.

 

Doh I'm sorry, some why I thought about Project Cars interview while typing this