The 7820X supports quad-channel DDR4 2666 MHz as the standard and up to 128 GB of RAM. You may notice that the L3 cache size has been reduced significantly compared to the 7820X’s Broadwell predecessor. There’s a good reason for that: Intel has reorganized their cache hierarchy in favor of additional L2 cache. The intention of the additional L2 cache (1 MB versus 256 KB per core) is to reduce calls to the L3 cache which is much slower, which in essence should improve efficiency.
The i7 7820X comes with 8 cores and 16 threads with a base clock speed of 3.6 GHz. This is a 400 MHz bump up over the i7-6900K. The turbo frequency is 4.3 GHz on all cores and 4.5 GHz on two cores thanks to Turbo Boost 3.0. So far, on the motherboards I have tested, the CPU basically runs at 4.3 GHz all the time. The TDP of the 7820X is 140 W, so a decent cooling solution is required if you want to run the CPU to its full potential. Compared to its predecessor, the 7820X has been pared down to 28 on-CPU PCIe 3.0 lanes, 12 less than the 6900K. Still enough for dual graphics but limited to an x16/x8 configuration.
The Intel Core i7-7820X offers an incredible 28 PCIe-Lanes for GPU connectivity as well as allowing NVME-SSDs direct access to the CPU and maintains a 3,3 GHz base clock. When required this CPU can activate all cores with Turbo Boost 2.0 and increase the frequency to a 4,3 GHz boost clock, with Boost Max 3.0 even allowing a maximum 4,5 GHz to be reached. Thanks to the unlocked multiplier the Intel Core i7-7820X can also be overclocked even further. Sufficient cooling is important for overclocking since the TDP of the CPU reaches 140 Watts prior to overclocking.
- New! Intel® Core™ i9 Extreme Edition processor featuring 18 cores and 36 threads
- New! Intel’s most scalable high-end desktop platform ever with 18, 16, 14, 12, 10, 8, 6, and 4- core options
- New! Intel® X299 chipset with improved I/O capabilities
- New! LGA 2066 socket for Intel® Core™ X-series processor family
- Additional system performance and amazing responsiveness with Intel® Optane™ memory support
- Improved Intel® Turbo Boost Max Technology 3.0 (select SKUs) for single- and multithreaded performance
- Up to 44 lanes of PCIe 3.0 directly connected to the CPU, to expand your system with fast SSDs, multiple discrete graphics cards, and ultrafast Thunderbolt™ 3 technology
- Up to 4 channel DDR4-2666 memory support, support for the Intel® Extreme Memory Profile (Intel® XMP) specification, revision 2.0 for DDR4
- Fully unlocked for performance tuning
- Rebalanced smart cache hierarchy
- Up to 10 percent faster multi-threaded performance over previous generations
- Up to 15 percent faster single-threaded performance over previous generations
The 8 cores of the Intel Core i7-7820X are essentially doubled using Hyper Threading, meaning up to 16 Threads can be processed simultaneously by this extreme CPU. As a result the Intel Core i7-7820X is not only a true performance beast in all things gaming, but also handles even high-res 4K video and VR content with ease. Additionally the maximum of four DDR4 memory modules using a Quad-Channel interface can reach a frequency of 2.666MHz without overclocking, a frequency easily attainable on virtually all X299 motherboards.
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