" PS4 is easier to develop for than PC and built around the Share button "

[ethomaz]

Kasz216 said:

First off, you completely made up those numbers.

Secondly your numbers are backwords.  I thought you said you were a developer in another thread.  How do you not know the difference between Latency and Bandwith.

Latency is the time it takes for a process to be processed.

Bandwith is the amount of data that can be processed at once.

GDDR5 has better Bandwith at the cost of Latency.

So using your made up numbers it would be....

 

GDDR5 can carry 10 "data" per movement

DDR3 can carry 1 "data" per movement

GDDR5 can do 12 movement per second

DDR3can do 170 movement per second

GDDR5: 10 x 12 = 120 per second

DDR3: 1 x 170 = 170 per second

No. Latency is the delay time between a data is accessed and another.... DRR3 can do more access in the same period than GDDR5 but GDDR5 can carry more data per access..

My example was bad because I mixed the words but it is still valid for gamers.... there is no way DDR3 is better for games than GDDR5.

Low latency is better for CPU that act in a linear fashion (execute instruction A, then B, then C, etc...)... so the CPU needs additional instruction for execution and in this case the low latency of DDR3 give you a fast response... and you can avoid the bad latency increasing the numbers of cores of a CPU so you can split the linear instruction between the cores (that is not the best scenario but helps when you have low latency).

So the 8-cores at low speed of the PS4 was choose on purpose to avoid that low latency... for low latency a 8-core CPU at low clock works better than a 4-core CPU at high clock.

That said... over 90% of a game processing is parallel and not act in a linear fashion... so the low latency not interfere in anything... in fact the high bandwidth is have more advantage than low latency for games... even the CPU calcs for games (AI, Physics, etc) are not linear... just parallel simulations... so even here the high bandwidth is better.

The Nextbox and Wii U have a big bottleneck to work due the use of DDR3... so they try to avoid that using eDRAM or eSRAM (Microsoft is even using data move engine units to remove this task from CPU/GPU trying to gain speed to fix the low bandwidth) but I can't say if the result will be good or bad (I expect good in MS console and not so good in Wii U).

Even AMD is adding support to GDDR5 in your future APU for PC Desktop.