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That said, five of the six tests here can push a quad-core, four-thread Intel CPU to full 100 per cent utilisation (the exception being Far Cry Primal, which relies heavily on single core power), but there is more leeway with the six-core i5 8400. What we found is that even with both patches in place, some games show no real difference at all - Ashes of the Singularity's punishing CPU benchmark remains completely consistent across all three of our test runs, as does our Notre Dame run through Assassin's Creed Unity, where any difference vanishes into the margin of error. The CPU-heavy Crysis 3 sails through the Meltdown test with no appreciable hit to performance, with the Spectre microcode update only hitting performance by two per cent. Far Cry Primal? Deduct 1fps for each of the security upgrades you install.
The Meltdown patch caused a 3.6 per cent hit to our test run through Rise of the Tomb Raider's Geothermal Valley, rising to 4.2 per cent with the BIOS update installed. However, our Witcher 3 test run - which hits storage hard and thrives on memory bandwidth - is hit comparatively hard, losing 8.2 per cent of its performance, rising to 9.4 per cent with the Spectre-orientated BIOS microcode update.
The good news is that performance is holding up: our tests here artificially push CPU performance to the forefront in a world where the GPU is the primary limiting factor in gaming. And even here, only one game sees an appreciable hit to performance and even that is in one part of a very well-optimised game that we've specifically chosen for CPU stress-testing. Most of The Witcher 3 plays much more smoothly
http://www.eurogamer.net/articles/d...-cpu-security-flaws-impact-gaming-performance
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