Intel Core i9-12900K Alder Lake 16 Core Flagship CPU Spotted With Over 5 GHz Clock Speed

Hassan Mujtaba
Intel Core i9-12900K Alder Lake 16 Core Flagship CPU Spotted With Over 5 GHz Clock Speed

The flagship Intel Alder Lake Core i9-12900K Desktop CPU has once again appeared within the SiSoftware SANDRA benchmark database and spotted by TUM_APISAK. This time, we get to see much higher clock speeds & inter-thread efficiency performance.

Intel Core i9-12900K Alder Lake Flagship Spotted With Over 5 GHz Boost Clocks, Blows Away The Core i9-11900K & Core i9-10900K In Inter-Thread Efficiency Benchmark

The Intel Core i9-12900K will be the flagship chip within the 12th Gen Alder Lake Desktop CPU line. The software lists down the processor with various clock speeds that might be the boost clocks for both, the P-Core (Golden Cove) and E-Core (Gracemont). So with that said, let's take a look at the specifications of the upcoming Core i9 chip.

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Intel's Core i9-12900K Alder Lake-S CPU will rock 16 cores and 24 threads. That's arranged in 8 P-Core (with 16 threads) and 8 E-Core (with 8 threads). The CPU features 30 MB of L3 cache which is arranged in 3 MB per core partitions on the P-Core (Golden Cove) and 3 MB per cluster on the E-Core (Gracemont). That's 8 P-Cores for 24 MB from the P-Cores and 6 MB from the two clusters comprising 4 E-Cores each. There's also 1.25 MB of L2 cache for a total of 12.5 MB on the entire chip.

As for clock speeds, the Intel Core i9-12900K is expected to feature a P-Core base and boost clocks of 3.2 GHz / 5.3 GHz and E-Core base and boost clocks of 3.0 / 3.9 GHz. These boost clocks are for a single-core. The all-core boost frequencies are expected to be 5.0 GHz for the P-Core and 3.7 GHz for the E-Core. The upper speeds will be achieved only when TVB (Thermal Velocity Boost) has been activated so normal boost speeds might be a little lower.

Intel 12th Gen Alder Lake Desktop CPU Specs

CPU NameP-Core CountE-Core CountTotal Core / ThreadP-Core Base / Boost (Max)P-Core Boost (All-Core)E-Core Base / BoostE-Core Boost (All-Core)L3 CacheTDP (PL1)TDP (PL2)Expected (MSRP) Price
Core i9-12900KS8816 / 243.4 / 5.5 GHz5.2 GHz2.4 / 3.9 GHz3.7 GHz30 MB150W260W$739 US
Core i9-12900K8816 / 243.2 / 5.2 GHz5.0 GHz2.4 / 3.9 GHz3.7 GHz30 MB125W241W$599 US
Core i9-129008816 / 242.4 / 5.1 GHzTBA1.8 / 3.8 GHzTBA30 MB65W202W$489 US
$464 US (F)
Core i9-12900T8816 / 241.4 / 4.9 GHzTBA1.0 / 3.6 GHzTBA30 MB35W106W$489 US
Core i7-12700K8412 / 203.6 / 5.0 GHz4.7 GHz2.7 / 3.8 GHz3.6 GHz25 MB125W190W$419 US
Core i7-127008412 / 202.1 / 4.9 GHzTBA1.6 / 3.6 GHzTBA25 MB65W180W$339 US
$314 US (F)
Core i7-12700T8412 / 201.4 / 4.7 GHzTBA1.0 / 3.4 GHzTBA25 MB35W99W$339 US
Core i5-12600K6410 / 163.7 / 4.9 GHz4.5 GHz2.8 / 3.6 GHz3.4 GHz20 MB125W150W$299 US
Core i5-12600606 / 123.3 / 4.8 GHz4.4 GHzN/AN/A18 MB65W117W$223 US
Core i5-12600T606 / 122.1 / 4.6 GHzTBAN/AN/A18 MB65W74W$223 US
Core i5-12490P606 / 123.0 / 4.6 GHzTBAN/AN/A20 MB65W74W~$250 US
Core i5-12500606 / 123.0 / 4.6 GHzTBAN/AN/A18 MB65W117W$202 US
Core i5-12500T606 / 122.0 / 4.4 GHzTBAN/AN/A18 MB35W74W$202 US
Core i5-12400606 / 122.5 / 4.4 GHz4.0 GHzN/AN/A18 MB65W117W$192 US
$167 US (F)
Core i5-12400T606 / 121.8 / 4.2 GHzTBAN/AN/A18 MB35W74W$192 US
Core i3-12300404 / 83.5 / 4.4 GHzTBAN/AN/A12 MB60W89W$143 US
Core i3-12300T404 / 82.3 / 4.2 GHzTBAN/AN/A12 MB35W69W$143 US
Core i3-12100404 / 83.3 / 4.3 GHzTBAN/AN/A12 MB60W
58W (F)
89W$122 US
$97 US (F)
Core i3-12100T404 / 82.2 / 4.1 GHzTBAN/AN/A12 MB35W69W$122 US
Intel Pentium Gold G7400202 / 43.7 GHzN/AN/AN/A6 MB46WN/A$64 US
Intel Pentium Gold G7400T202 / 43.1 GHzN/AN/AN/A6 MB35WN/A$64 US
Intel Celeron G6900202 / 23.4 GHzN/AN/AN/A4 MB46WN/A$42 US
Intel Celeron G6900T202 / 22.8 GHzN/AN/AN/A4 MB35WN/A$42 US

The Core i9-12900K in the benchmark was running at around 5.08 GHz which is close to its all-core frequency. There's also another clock mentioned at 3.6 GHz which could be the average boost clock of the E-cores though that remains to be seen. The SiSoftware Sandra benchmark was unable to get the exact power figures hence the standard 125W (PL1) TDP is mentioned. The good thing is that the benchmark this chip was tested within doesn't rely on power figures to measure the CPU inter-thread efficiency. In the recent leak, it is stated that Alder Lake CPUs will hybrid cores to work in parallel for improved thread handling while retaining a 125W TDP but we can't say if this works on existing benchmarks running on older Windows operating systems.

So in terms of Inter-Thread efficiency, a benchmark that measures the efficiency of inter-thread, core, module, node, & inter-package communication fabrics, the Intel Core i9-12900K scored an average of 112.30 GB/s. In the same benchmark, the Core i9-10900K scores 85.89 GB/s while the Core i9-11900K scores 80.60 GB/s.Both AMD Ryzen 9 5950X & Ryzen 9 5900X though deliver much faster performance within the same benchmark.

Intel Core i9-12900K Inter-Thread Efficency Performance Benchmark
Score (GB/s)
Ryzen 9 5950X
Ryzen 9 5900X
Core i9-12900K
Ryzen 7 5800X
Core i9-10900K
Core i9-11900K
Core i9-9900K

The CPU was running on the Intel Alder Lake Client platform with DDR5 UDIMMs. So overall, you can see that the inter-core latencies are improved by a huge margin on the upcoming Alder Lake CPUs. The Intel Alder Lake CPUs are expected to launch in November with an announcement by end of October.

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