AMD Launches 8700F & 8400F Budget Gaming CPUs

CPUs, News

AMD has launched two new low-priced CPUs based on its recently reviewed 8700G: Dubbed the Ryzen 7 8700F and Ryzen 5 8400F, these two new models use the same cores but with the high-powered Radeon 780M (740M for the 8500G) completely disabled. Gaming-capable graphics being the primary reason these cores exist, the 8700F comes at a substantially discounted price of $269. That’s $60 cheaper than the 8700G.

Meanwhile, the $169 8400F is only $10 cheaper than the 8500G. There could be a good reason for this: Check out the PCIe configuration near the bottom of this table:

General Specifications
NameAMD Ryzen™ 7 8700GAMD Ryzen™ 7 8700FAMD Ryzen™ 5 8500GAMD Ryzen™ 5 8400F
# of CPU Cores8866
Multithreading (SMT)YesYesYesYes
# of Threads16161212
Max. Boost Clock Up to 5.1 GHzUp to 5 GHzUp to 5 GHzUp to 4.7 GHz
Base Clock 4.2 GHz4.1 GHz3.5 GHz4.2 GHz
L2 Cache8 MB8 MB6 MB6 MB
L3 Cache16 MB16 MB16 MB16 MB
Default TDP65W65W65W65W
AMD Configurable TDP (cTDP)45-65W45-65W45-65W45-65W
Processor Technology for CPU CoresTSMC 4nm FinFETTSMC 4nm FinFETTSMC 4nm FinFETTSMC 4nm FinFET
CPU Compute Die (CCD) Size178mm²178mm²137mm²178mm²
Package Die Count1111
Unlocked for Overclocking YesYesFinFETYes
AMD EXPO™ Memory Overclocking TechnologyYesYesYesYes
Precision Boost OverdriveYesYesYesYes
Native USB 4 (40Gbps) Ports2222
Native USB 3.2 Gen 2 (10Gbps) Ports2222
Native USB 2.0 (480Mbps) Ports1111
PCI Express® VersionPCIe® 4.0PCIe® 4.0PCIe® 4.0PCIe® 4.0
Native PCIe® Lanes (Total/Usable)20 , 1620 , 1614 , 1020 , 16
NVMe SupportBoot , RAID0 , RAID1Boot , RAID0 , RAID1Boot , RAID0 , RAID1Boot , RAID0 , RAID1
System Memory TypeDDR5DDR5DDR5DDR5
Memory Channels2222
Max. Memory256 GB256 GB256 GB256 GB

We should ignore the four hidden lanes on each processor and speak only of those that are capable of serving graphics cards and high-bandwidth NVMe drives: Three of the above processors have 16 of those, while one, the 8500G has only 14.

We’re not certain why AMD decided to give the 8400F all sixteen lanes. Most motherboards are wired to to feed the top NVMe storage slot directly with CPU lanes, leaving the graphics card to run in x8 mode and leaving the remaining two or four lanes with nowhere to go. We don’t think anyone will notice whether there are two or four lanes going nowhere.

Then again, perhaps we can look forward to low-cost motherboards that get their storage exclusively from the external chipset component (AMD calls this component a “promontory”). Such a design would allow even these cheap processors to connect a graphics card with the full sixteen lanes. We’ll keep an eye out for such developments.

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