Gadgetory

hello I'm Gary Sims from and Roger this is my third video that I'm doing this week and today's videos at the cortex a 55 previously spoken by dynamic the new processes designed from arm I spoke about the cortex a 75 the high-performance core from arm and now we've come to the energy efficiency core so what is the court it's a 55 and what will it mean to us well let me explain now the cortex a53 has been an absolutely amazing processor it was a 64-bit processor it had high energy efficiency and arm say there have been over one point seven billion cortex a53 caused shipped in the last few years so that's absolutely amazing and we own all of our phones whether it's from Huawei or whether it's from Samsung whether it's one that's using a Qualcomm chip set there are going to be some courted 8:53 calls in their handling that power efficiency stuff now with the advent of dynamic and these new movement from putting the cause both the power efficiency calls and the high power cords into the same cluster arm have released a new energy efficiency processor to replace the cortex a53 so the court is a 55 start where the a 53 left off and what they've done is they've tweaked it to make it more power efficient and yet to offer greater performance so overall we're going to see round about a 20 percent increase in performance compared to the a 53 and in fact in some circumstance in particular its memory intensive throughput we might even see double the performance compared to the cortex a53 and you take a something like deep bench for then over there you going to get about 18 to 20 percent performance in the overall running or the other long video benchmarks I like a great performance step for this power efficient core who isn't aimed at perform with is aimed at power efficiency and even though it increased that performance we actually find a 15 percent better of energy usage so more performance low lower energy balls what more could we ask for now like the a fifty three before it this is an inorder processor that means it doesn't execute anything instructions out of order the order they come in the pipeline is the order that it executes and doesn't need to try and check to see whether it can run one while it's running another to try and it just is right whatever is coming on the pipeline that's the order I'm going to execute in which makes it simpler and of course more power-efficient but of course you do sacrifice a bit of a performance but that's what we call it a 75 core is for of course and just let the cortex a 75 the a 55 is really kind of concentrating on sustained performance it's all very well saying about 20% performance increases out only lasts three minutes and then dives down because the chip gets too hot know that the a 55 is also able to maintain that level of sustained performance now the court is a 55 is not going to get the center of attention as the a 75 does because the a 75 is where all the benchmark scores are going to be tested again can be compared different manufacture of each other but the reality is we all use the cortex a53 every single day in our smartphones and it really has become the bedrock of our mobile computing and it is important that we understand that the 855 is continuing with that tradition of power efficiency and yet good performance in a 64-bit ARM processor now here's a look at some of the micro architectural details of the cortex 855 these of course based on the cortex a53 but now of course we've got the new level 2 cache integrated because we're moving over to the dynamic core there's a much better branch predictor which is important for making sure that the pipe stays full of all of the instructions need to run it's using an inorder eight stage pipeline and of course it has the latest ARM architecture revision which is armed v 8.2 it's worth mentioning that v 8.2 is the standard for the dynamic clusters so the arm core is a 75 in the quarters a 55 are all 8.2 and they have to be the same so that when programs switch from one to the other the same instructions work in exactly the same way which also means of course you can't use the a 75 with a is a 53 and you can't use a court it's a 73 with the cortex a 55 there has to be the 75 and the 55 and whatever future generations are bring out using the vr 8.2 architecture now it's really interesting because the a 55 is using a neural network for doing its branch predictors now our work quite clear they weren't going to release many details about this but the basic thing the idea is a neural network for a branch predictor is actually a very good and actually quite well known in CPU design field idea for making branch predictors it doesn't use up much silicon it gives good results it's not as good as maybe a complex branch predictor which is what you find in the a 75 doesn't use a neural network product predictor but you do find it in the a 55 so when you're using your new phones next year in 2018 just give it a thought with the a 55 cores got a newer network built into it and so then we have it the new power efficiency core from arm partners the cortex a 75 we're going to see in fold in 2018 we might see phones is four or even six or even seven eight of these cortex a 55 calls and just like the corners in 53 before it's going to become the foundation of our low energy computing over the next few years my name is guys didn't reminder authority I hope you enjoyed this video if you did please do give it a thumbs up this is the third video of me this week about the announcements to arm have made the next video will be on the Mali g72 GPU so make sure you subscribe to Andrew Loura T's YouTube channel hit that icon Bell so that you get a notification when we publish a new video and last but not least do go over to Andrew folding calm because we are your source for all things Android