High-Performance Desktop: 65W to 35W Coffee Lake CPUs

Posted by Larita Shotwell on Wednesday, September 25, 2024

Coffee Lake Desktop Processors

The final part of the launch is focused around filling out the processor line-up for the desktop. Intel launched six Coffee Lake-based desktop processors back in October, so we have had almost a five month wait for the rest of the line to see the light of day. In this batch of processors we see the regular and low powered processors that normally sit in Intel’s strategy, as well as a number of Pentium and Celeron parts.

AnandTechCoresTDPFreqL3vProDRAM
DDR4
iGPUiGPU
Turbo
Core i7-8700K$3596 / 1295 W3.7 / 4.712 MBNo266624 EUs1200
Core i7-8700$3036 / 1265 W3.2 / 4.612 MBYes266624 EUs1200
Core i7-8700T*$3036 / 1235 W2.4 / 4.012 MBYes266624 EUs1200

For the Core i7 family, the new entrant is the Core i7-8700T. This will be the only six-core processor, with hyperthreading, to fall into the 35W bracket. It features the full L3 cache support, dual channel memory up to DDR4-2666, and is eligible for vPro support. It is worth noting that the 35W TDP value is only valid when the CPU is at its base frequency, which in this case is 2.4 GHz. At the peak turbo of 4.0 GHz, or for all-cores somewhere in the middle (again, Intel won’t specify), the power will obviously be higher.

AnandTechCoresTDPFreqL3vProDRAM
DDR4
iGPUiGPU
Turbo
Core i5-8600K$2576 / 695 W3.6 / 4.39 MBNo266624 EUs1150
Core i5-8600*$2136 / 665 W3.1 / 4.39 MBYes266624 EUs1150
Core i5-8600T*$2136 / 635 W2.3 / 3.79 MBYes266624 EUs1150
Core i5-8500*$1926 / 665 W3.0 / 4.19 MBYes266624 EUs1100
Core i5-8500T*$1926 / 635 W2.1 / 3.59 MBYes266624 EUs1100
Core i5-8400$1826 / 665 W2.8 / 4.09 MBNo266624 EUs1050
Core i5-8400T*$1926 / 635 W1.7 / 3.39 MBNo266624 EUs1050

In the Core i5, most of the parts are new. As with the Core i5 desktop parts that are already launched, these have six-cores but do not have multithreading. They have a reduced L3 cache per core compared to the Core i7, and it is worth noting that the base frequency for the processors does not actually get that high – only 3.1 GHz for the Core i5-8600. All of the parts support dual channel DDR4-2666, and all but one processor supports vPro.

AnandTechCoresTDPFreqL3vProDRAM
DDR4
iGPUiGPU
Turbo
Core i3-8350K$1684 / 491 W4.08 MBNo240023 EUs1150
Core i3-8300*$1384 / 465 W3.78 MBNo240023 EUs1150
Core i3-8300T*$1384 / 435 W3.28 MBNo240023 EUs1100
Core i3-8100$1174 / 465 W3.66 MBNo240023 EUs1100
Core i3-8100T*$1174 / 435 W3.16 MBNo240023 EUs 1100

There are only three new members of the Core i3 section, all of which are quad-core processors. The two Core i3-8300/T parts have the peak 2MB L3 per core, while the Core i3-8100T only has 1.5 MB L3 per core. These parts are all reduced in memory frequency as well, supporting dual-channel DDR4-2400. Intel has no vPro parts in the Core i3 line, but all the Core i3 SKUs will support Optane.

AnandTechCoresTDPFreqL3DRAM
DDR4
iGPUiGPU
Turbo
Pentium Gold G5600$862 / 454 W3.94 MB2400UHD 630350 / 1100
Pentium Gold G5500$752 / 454 W3.84 MB2400UHD 630350 / 1100
Pentium Gold G5500T$752 / 435 W3.24 MB2400UHD 630350 / 1100
Pentium Gold G5400$642 / 454 W3.74 MB2400UHD 630350 / 1050
Pentium Gold G5400T$642 / 435 W3.14 MB2400UHD 630350 / 1050

The Pentium Gold processors fit in where the older Core i3 processors once stood: dual core with hyperthreading. Intel rates the ‘full speed’ models at 54W, while the lower-power T-models are at 35W. One of the bigger disadvantages of these parts is the lack of Optane support, plus also the DDR4-2400 memory support, however they do fill up the lower cost market. Intel differentiates the Pentium Gold as having the latest Core microarchitecture compared to Pentium Silver which uses the Atom core design.

AnandTechCoresTDPFreqL3DRAM
DDR4
iGPUiGPU
Turbo
Celeron G4920$522 / 254 W3.22 MB2400UHD 610350 / 1050
Celeron G4900$422 / 254 W3.12 MB2400UHD 610350 / 1050
Celeron G4900T$422 / 235 W2.92 MB2400UHD 610350 / 1000

No real fancy words for Celeron here: these are Intel’s dual core designs for the cheapest Intel-based PCs. Just pair one up with a H310 motherboard, a single stick of memory, and a cheap HDD, and there’s a PC. What is different is that Intel has dropped the 'G' in the SKU name in the document they gave us (such as G4920). We have seen other documents from Intel that have the G, so we need see why there is a discrepancy.

Update: ARK confirms that all the Celerons have 'G' in the name.

* New Parts

** Blank spots in tables will be filled in as we get information

Per-Core Turbo Ratios

Due to some sleuthing, and despite Intel's insistence these are proprietary information, we have all the official per-core turbo ratios for this processors.

The most interesting element to these values are the 35W low-powered T processors. In each case, the all core turbo is much, much higher than the base frequency. For example, the Core i5-8400T has a base frequency of 1.70 GHz, but the all-core turbo is set at 3.0 GHz - almost double. Given the fact that TDP is defined at the base frequency, it is quite clear that the all-core turbo mode suggested to motherboard manufacturers is going to blow that 35W limit on the i5-8400T.

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