Intel Core i5 8400.............
After months of endless AMD praise, Jarred Walton finally has some good news for Intel and the Blue processor team.
Big Blue is back with the new Coffee Lake processor architecture. It’s impressive and should probably be powering your next Linux PC. Find out why!
Coffee Lake is the biggest generational improvement in Intel’s mainstream CPU line since the mainstream/enthusiast split, which occurred with the firstgeneration Core i7 in 2010. Core i7 and Core i5 both get 50 per cent more cores/threads, without a drop in clockspeeds, and Core i3 basically takes the previous generation Core i5’s place as a 4C4T part.
Before rushing out and buying a Core i5-8400 be aware that Coffee Lake processors require a new motherboard and a 300-series chipset. Right now, that means the high-end Z370. This is because of modified power requirements on Coffee Lake. As for the Z370 chipset, in terms of features and functionality it appears to be identical to Z270 – just with some updated microcode that only recognises Coffee Lake processors.
Take your existing Core i5 processors and add 50 per cent more cores, and what does that give you? For games that already hit maximum performance on an i5-7600K, it won’t do much, but there are an increasing number of games that will show small to moderate gains with more cores and/or threads.
Generally speaking, HyperThreading on an Intel CPU core gives you about a 20-30 per cent boost in potential throughput, so having six full cores running six threads is actually going to be faster than four cores and eight threads – at least at the same clockspeed. In the overall average gaming performance metric, the ‘budget’ Coffee Lake i5-8400 ends up beating the former champion i7-7700K.
Practically speaking, most gamers wouldn’t notice any difference between any of the various Core i5 and Core i7 processors for gaming purposes, even with a GTX 1080 Ti. With a more modest GPU and/or a higher resolution, the six-core Ryzen 5 and 8-core Ryzen 7 are also right in the mix with Core i5/i7. They’re rarely, if ever, faster in games, but most of the time the difference isn’t going to be felt so much as imagined.
Measuring performance
How does the i5 Coffee Lake fare in CPU-intensive workloads? This time the newcomer i5 falls just behind the i7-7700K, mostly influenced by tests where the i7’s higher clockspeed comes into play. The i5-8400 falls behind in Cinebench1T by 16 per cent, and four per cent in the CinebenchnT test. Video encoding is a tie, with a slight lead for the i5-8400 in x264’s more demanding second pass. VeraCrypt favours the i5.
Looking at other comparisons, the i5-8400 also falls behind the Ryzen 7 processors in most tests, as well as falling slightly behind the Ryzen 5 1600X. The Ryzen 5 1600 is the inflection point, with the i5-8400 taking back the overall lead, and by the time we get to the 4C8T Ryzen 5 parts the i5-8400 leads in every test.
In terms of pricing, the most direct competition is AMD’s Ryzen 5 1600 (£190 compared to £200 for the Core i5-8400), while the Ryzen 5 1600X sits a bit higher up the ladder at £220. It’s worth pointing out that all of these processors include a cooler, although motherboard pricing generally favours AMD with its B350 boards: X370 AM4 boards end up being very similar in price to the Z370 boards.
Prior to Coffee Lake, Intel’s Core i5 processors were always a bit of a compromise, you had to give up some multi-threaded performance. That’s still true to an extent, but by finally moving beyond quad-core Intel makes up for many of the i5’s shortcomings. Relative to the previous generation i7-7700K, the i5-8400 offers similar performance. It’s a bit faster in gaming tests, a bit slower in overall application performance, but crucially it costs about half as much.
There are now three primary candidates in the £200 CPU market: Core i5-8400, Ryzen 5 1600, and Ryzen 5 1600X. For gaming purposes, Core i5-8400 is the way to go, delivering 25-35 per cent better performance than the Ryzen 5 parts. Clearly, the Core i5-8400 the best overall processor in the mainstream market.