It all starts off at the front-end of the core with the branch-prediction unit. SaccoSVD is offline Quote Quick Reply. The basic unit of a Ryzen processor is a CCX or Core Complex, a quad-core CPU model with a shared L3 cache. This is why it is able to now process AVX256 in one clock cycle, double that of original Zen. Put simply, Zen 2 has more ALU capability than Zen(+), and is able to issue seven per clock cycle up from six.AMD also recognised that while the floating-point potential of Zen was rather handsome in real-world instances, it needed to beef-up the AVX capability by going wider. The theme of larger is better continues with the MOP cache growing to 4K. The exact gain is dependent on how diverse workload benefits from each of these performance-adding features - some respond excellently to heaps more cache and associated lower average latency, others to floating-point, but in every case Zen 2 ought to be faster than Zen(+) on a clock-for-clock basis.Evolutionary designs enable engineers to pick off all the low-hanging fruit missed first time around, iron out bottleneck kinks, and then focus on laying down transistors that enhance performance.So, now that we have a firm grounding into how Zen 2 is built, and why it is better from an IPC, flexibility, and footprint point of view, let's now see how the various models stack up. This change was made for important reasons, which we’ll go into over the next pages. Not such a big deal in the server world where extra cores and threads can make up the shortfall, but certainly a consideration in the client space.There is, however, another manifest reason why AMD has gone L3 cache-heavy. To give an example, the Ryzen 9 3950X has two CCDs, each with two CCX clusters. Decoding them once and putting them into a large(r) cache speeds things up and makes the processor more efficient.Whether you are designing for an ARM core or high-performance x86, as in this case, there are a number of techniques that CPU architectures adopt in order to enhance IPC. At a high level, the core looks very much the same. This modular CCD is then connected to the I/O chip via a high-speed data fabric. The chiplet has about 3.9 billion transistors, while the 12 nm IOD (I/O Die) is ~125 mm 2 and has 2.09 billion transistors. Finally it shows how long the same computation takes with a single thread. The way in which Zen 2 is designed means that each CCX's average latency to main memory is about the same, irrespective if you have one, two, … This is especially handy because no processor wants to decode micro-ops multiple times. Highlights of the Zen 2 design include a different L2 branch predictor known as a TAGE predictor, a doubling of the micro-op cache, a doubling of the L3 cache, an increase in integer resources, an increase in load/store resources, and support for single-operation AVX-256 (or AVX2). Despite the increase in L3 Cache size, physically the Zen 2 CCX is 47% smaller than the Zen CCX at just 31mm^2 (72mm^2 per CCD), representing the huge density improvement offered by 7nm production. Per CCX OC Settings: 4.5/4.4/4.375/4.375 at 1.331V (1.306V vdroop) Max AIDA64AVX temp 80c balanced AIO (23 room temp) Last edited by SaccoSVD; 08-09-2019 at 04:37 PM. Each 7 nm "Zen 2" chiplet (CCD) physically features eight CPU cores spread across two CCX (compute complexes) with four cores and 16 MB of L3 cache, each. Sponsored Links Overclock.net. For the 6-core Ryzen 5 and 12-core dual-chiplet Ryzen 9 3900X, one core per CCX is disabled, yielding a 3+3 core CCX configuration. All rights reserved.The beauty is that, should AMD want more cores and threads for a particular segment, a second 8C16T CCD can be further added and connected to the I/O via the same high-speed link.How? Back on point, having 16MB of L3 cache per CCX helps mitigate against moving the I/O functions over to a separate, distinct block - it's a necessary evil of going down a chiplet architecture.Zen 2, which began life in mid-2015 according to CPU chief Mike Clark, was designed primarily to boost the all-important instructions per clock cycle (IPC) metric which historically has been lacking on AMD chips when compared directly to Intel. ... (CCX) clusters. There's a little more to it than that, because each dual-CCX CCD has a few extra bits of silicon (Infinity Fabric) that takes it up to 74mm², yet there's still clear advantage in going down the cutting-edge route.Looking midway down, into the guts of Zen 2, shows that AMD maintains the four ALUs of Zen but adds a third address generation unit (AGU) for accelerating the calculation of memory addresses needed before grabbing data from memory. The L1 data cache and L2 caches are unchanged, however the translation lookaside buffers (TLBs) have increased support. Zen … post #2 …

Having excellent accuracy here - knowing with near-perfect certainty which way branches are going to go - enables fewer pipeline misses, conserves power, and fundamentally powers the execution cores. A CPU architect spends an inordinate amount of time at this stage because it sets the scene for everything that follows.The purpose of this article is to explain, in relatively high-level detail, the key differences and improvements of Zen 2 compared with the original Zen and incrementally-updated Zen+ architectures that underpin Ryzen 1000- and Ryzen 2000-series chips.In an interesting move, after analysing numerous applications and their dataset size, the instruction cache actually drops from 64KB to 32KB but increases associativity from 4-way to 8-way.

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