<p style="margin:0px;padding:0px;font-family:Lato, Calibri, Arial, sans-serif;font-size:14.3999996185303px;line-height:21.5999984741211px;">A <a target="_blank" href="http://fudzilla.com/news/processors/38402-amd-s-coherent-data-fabric-enables-100-gb-s" style="text-decoration:none;color:#0055ff;" target="_blank">recent report by Fudzilla</a> has spilled the beans on <strong>the codename of a certain Zen based processor from AMD: “Zeppelin”</strong> . If you are reading this, then you probably know the drill (notice the rumor tag above). We have already heard alot about coherent fabric but this leak not only<strong> reveals the exact speed of the data fabric</strong> but the codename of a processor that will eventually use it as well.</p> <p style="margin:0px;padding:0px;font-family:Lato, Calibri, Arial, sans-serif;font-size:14.3999996185303px;line-height:21.5999984741211px;"><a target="_blank" href="http://cdn.wccftech.com/wp-content/uploads/2015/01/AMD-Zen-Summit-Ridge.jpg" class="lightbox" style="text-decoration:none;color:#0055ff;" target="_blank"><img class="aligncenter size-large wp-image-113260" src="http://cdn.wccftech.com/wp-content/uploads/2015/01/AMD-Zen-Summit-Ridge-635x249.jpg" alt="AMD Zen Summit Ridge" width="635" height="249" style="border:0px;display:block;margin-left:auto;margin-right:auto;"></a></p> <h1 style="margin:0px;padding:0px;font-size:25.9200000762939px;font-family:'Roboto Condensed', Arial, sans-serif;line-height:1.2;">AMD Zeppelin CPUs to use Coherent Data Fabric to communicate with the GPU</h1> <p style="margin:0px;padding:0px;font-family:Lato, Calibri, Arial, sans-serif;font-size:14.3999996185303px;line-height:21.5999984741211px;">I’ll admit I was slightly queasy about this particular rumor – mostly because it reveals too much and too little at the same time. While the source’s history can be considered mostly authentic, this particular slide reveals the codename of a future AMD processor; and since we are talking about an MCM and a custom interconnect, I would be willing to wager this is an Opteron variant. The leak also sheds light on just how much faster Coherent Fabric is from the standard PCIe interface.<span></span></p> <p style="margin:0px;padding:0px;font-family:Lato, Calibri, Arial, sans-serif;font-size:14.3999996185303px;line-height:21.5999984741211px;">The report states that AMD is currently working on a Multi Chip Module that will have a Zeppelin CPU and Greenland GPU connected by Coherent Data Fabric. High Bandwidth Memory (probably on a 2.5D interposer) will be involved as well and will be clocked at 500 GB/s. The homegrown interconnect will support data rates of upto 100GB/s which is alot faster than what the PCIe interface sustains (around 15GB/s). Not only that but latency has been reduced from 500ns to an unknown but allegedly smaller number.</p> <p style="margin:0px;padding:0px;font-family:Lato, Calibri, Arial, sans-serif;font-size:14.3999996185303px;line-height:21.5999984741211px;"><a target="_blank" href="http://cdn.wccftech.com/wp-content/uploads/2015/08/7e42c9447e754167c85105ffe1a1d866_L.jpg" class="lightbox" style="text-decoration:none;color:#0055ff;" target="_blank"><img class="aligncenter size-full wp-image-160716" src="http://cdn.wccftech.com/wp-content/uploads/2015/08/7e42c9447e754167c85105ffe1a1d866_L.jpg" alt="7e42c9447e754167c85105ffe1a1d866_L" width="620" height="465" style="border:0px;display:block;margin-left:auto;margin-right:auto;"></a></p> <p style="margin:0px;padding:0px;font-family:Lato, Calibri, Arial, sans-serif;font-size:14.3999996185303px;line-height:21.5999984741211px;">The Zeppelin and Greenland based MCM will feature 4 GMIs or Global Memory Interconnects (which constitute the Coherent Data Fabric I suppose) allowing the CPU to converse with the GPU at 100GB/s. T<strong>he compute of the GPU is rated at 4.0+ TFlops. Unfortunately, they do not mention whether these are single or double precision numbers and we cant really make any assumptions here either</strong> (both are plausible). The MCM itself will contain the GPU and CPU side of things and will talk to the RAM at 100 GB/s as well – allowing for a very HSA friendly environment and minimum bottleneck throughout the whole process.</p> <p style="margin:0px;padding:0px;font-family:Lato, Calibri, Arial, sans-serif;font-size:14.3999996185303px;line-height:21.5999984741211px;">Previous leaks (from the same source I might add) indicated that <strong>the processor will be using AMD’s Coherent Fabri</strong>c. <strong>Each Zen core will have access to 512KB of L2 cache and 4 Zen cores will share 8MB of L3 cache in the ‘Exascale Heterogeneous Processor’.</strong> That equates to a grand total of 16MB L2 Cache and 64 MB L3 cache. Each Zen core will be capable of running two threads (thanks to the company’s shift to Simultaneous Multi-Threading). The processor is thought to have 4 DDR4 channels with a capacity of 256GB per channel.</p><span style="font-family:Lato, Calibri, Arial, sans-serif;font-size:14.3999996185303px;line-height:21.5999984741211px;"><br><br>Read more: <a target="_blank" href="http://wccftech.com/amd-opteron-mcm-zeppelin-cpu-greenland-hbm-data-fabric/#ixzz3iPeA3I9g" style="text-decoration:none;color:#003399;" target="_blank">http://wccftech.com/amd-opteron-mcm-zeppelin-cpu-greenland-hbm-data-fabric/#ixzz3iPeA3I9g</a></span> <div><br></div> <div><br></div> <div><br></div>
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