AMD Athlon II X4 651K

AMD Athlon II X4 651K is a desktop processor from AMD’s Athlon II X4 (Llano) generation, built on K10 architecture at GlobalFoundries on a 32 nm process. It records 4 cores and 4 threads, a base clock of 3.00 GHz, and a TDP of 100. The package is AMD Socket FM1, memory support is DDR3 on a dual-channel bus, PCIe is Gen 2, and there is no integrated graphics. The fact pack lists 1,178 million transistors on a 228 mm² die, 128 KB of L1 and 1 MB of L2 per core, no L3 cache, an unlocked multiplier, end-of-life production status, and a release date of 2011-11-13. It also lists no benchmark scores and no nearest-rival entries; the only aggregate placement is the 50th percentile versus all CPUs in the database.

Benchmark Performance

The benchmark section of this record is empty. The `benchmarks` array contains no scored entries, the `avgBenchmarkScore` field is 0, and the `nearestRivals` array is empty. Because of this, exact percentage deltas against rival processors cannot be produced from the FACT PACK. There are no rival scores to compare, no deltaPct values to quote, and no single-thread or multi-thread benchmark results to interpret. The only quantitative performance anchor is `percentileVsAllCpus: 50`, which places the Athlon II X4 651K at the midpoint of the database’s CPU distribution.

A 50th percentile rank is a neutral signal. It does not reveal how close surrounding CPUs are, nor does it show whether the processor is closer to the 49th or the 51st percentile in raw score terms. The absence of score data makes this percentile difficult to use as a precise performance measurement. It is better treated as a coarse placement marker: the processor is recorded as neither at the top nor at the bottom of the database’s overall CPU ranking. The average benchmark score of 0 further reinforces that no sampled mean has been recorded for this part; it should not be read as a tested result of zero. In short, the benchmark-performance section of this page cannot support statements like “30% ahead of X” or “20% behind Y” because the underlying data was not included in the FACT PACK.

Without benchmark scores, the 50th percentile is the only comparative number available. The data does not allow a workload-specific score breakdown. It also does not permit an assessment of whether the 4-core/4-thread configuration performs better in lightly threaded or fully threaded tasks. The record simply lacks the measured components required for that analysis. Any benchmark claims made elsewhere would have to come from outside this FACT PACK, which is outside the scope of this database entry.

Platform and Compatibility

The Athlon II X4 651K is an AMD Socket FM1 processor. Its architecture is K10, and its codename is Llano, with the generation field recorded as “Athlon II X4 (Llano).” The chip is fabricated by GlobalFoundries on a 32 nm process. The die contains 1,178 million transistors and has a die size of 228 mm². The memory controller supports DDR3 in a dual-channel configuration, and ECC memory is not supported. The PCIe interface is Gen 2. There is no integrated graphics, meaning the processor package itself has no GPU output. A system using this CPU would need a separate graphics card for display output.

The multiplier is unlocked, so the clock multiplier can be changed by an owner. The base clock is 3.00 GHz, and no boost clock is present in the fact pack. Because production status is end-of-life, the platform is not in current production. The recorded release date is 2011-11-13. The part number in the record is AD651KWNZ43GXAD651KWNGXBOX. For platform compatibility, the key facts are Socket FM1, DDR3 dual-channel memory, PCIe Gen 2, and no ECC support. The absence of L3 cache is also notable: each core has 128 KB of L1 and 1 MB of L2, but there is no L3 record. Builders on this platform should expect to use an FM1 motherboard, DDR3 DIMMs, and a discrete GPU. Because the product is end-of-life, the upgrade path is limited to the FM1 ecosystem that was available during that generation; no other socket or memory standard is listed.

Who Should Consider It

With no benchmark scores, workload recommendations cannot be grounded in measured results. The only basis for guidance is the processor’s configuration: 4 cores, 4 threads, a 3.00 GHz base clock, and a 100 W TDP. With that in mind, this processor fits users already invested in Socket FM1 and DDR3 who need a 4-thread desktop part and have a separate graphics solution. Because there are no integrated graphics, anyone building with this CPU must already plan to install a discrete GPU or another display adapter.

Workloads that use exactly four threads can use all four cores directly. The 4-core/4-thread layout means there are no additional logical threads per core in the record. Software that wants more than four threads will not find spare threads on this part. For office-style desktop tasks, a 3.00 GHz four-core chip may be a plausible baseline, but the FACT PACK contains no office benchmark to confirm that. For creation workloads such as rendering or video encoding, the absence of an L3 cache and the presence of only four threads suggest a limited ability to scale beyond moderate thread counts, though no score exists to prove it. For gaming, the record contains no frame-rate or gaming-specific score, so no performance recommendation can be made. The only general statement the data supports is that the 651K sits at the 50th percentile of all CPUs in the database, which is a middle-of-the-pack position rather than a top-tier one.

Users who overclock may be interested because the multiplier is unlocked. The fact pack does not record any overclocked clock speeds or thermal figures, so the practical benefit of that unlocked multiplier cannot be quantified here. Still, the unlocked multiplier is a distinguishing feature in the record. Users who require ECC memory should avoid this processor because ECC is not supported. Users who need integrated graphics should also avoid it because the integrated graphics field is null.

How It Compares

The `nearestRivals` array in the FACT PACK is empty. There are no listed rival names, no rival scores, and no deltaPct values. Consequently, this section cannot provide one short paragraph per nearest rival. The only comparative quantity available is the 50th percentile versus all CPUs. Without directly named rivals, the page cannot show whether the Athlon II X4 651K sits close to any particular competitor or far away from another.

The absence of rival data is itself meaningful. It means the database record for this processor has no nearest-neighbor entries, so any comparison to another processor would require external information that is not present. The 50th percentile remains the sole broad comparison point: the processor is positioned in the middle of the database’s overall CPU distribution. No exact percentage gap can be stated, because those gap numbers were not supplied.

Single-Thread vs Multi-Thread Behavior

The record shows 4 cores and 4 threads. That symmetry means each physical core appears as a single thread in the data. There is no listed SMT or extra thread count, so multi-threaded scaling is capped at four threads. A workload that needs more than four threads will have to queue work behind those four cores, and the fact pack gives no indication of any additional logical threads.

Single-thread behavior is shaped by a 3.00 GHz base clock and the K10 architecture. No boost clock is recorded, so the data does not indicate a higher single-core turbo frequency. Each core has 128 KB of L1 cache and 1 MB of L2 cache, but there is no L3 cache in the record. That cache arrangement means shared data that is not in a core’s private L2 must pass through the memory subsystem. The memory bus is dual-channel DDR3, which is the only memory bandwidth context supplied. This structure may help workloads with strong per-core locality, but the FACT PACK contains no scores to demonstrate that effect.

For real workloads, the single-thread versus multi-thread split suggests two limits: a single thread is limited by the 3.00 GHz clock and K10 core design, while multi-threaded work can use four cores but no more. The 50th percentile rank is an aggregate signal, but it does not break down into single-thread and multi-thread scores. The data therefore does not support a detailed claim about whether the processor is stronger in steady single-core tasks or in parallel four-thread tasks. What can be said from the numbers is that the processor has a fixed base clock, no recorded boost clock, four threads, and no L3 cache.

FAQ

Q: What socket does the AMD Athlon II X4 651K use?

A: It uses AMD Socket FM1.

Q: Does the Athlon II X4 651K have integrated graphics?

A: No. The integrated graphics field is null, so a separate graphics adapter would be needed for display output.

Q: How many cores and threads does it have?

A: It has 4 cores and 4 threads, with a base clock of 3.00 GHz.

Q: What memory type does it support?

A: It supports DDR3 on a dual-channel memory bus. ECC memory is not supported.

Q: Is the multiplier unlocked?

A: Yes. The fact pack lists `multiplierUnlocked` as true.

Q: What is the production status and release date?

A: The production status is end-of-life, and the release date is 2011-11-13.

Power and Thermals

The TDP is listed as 100, placing this processor in a 100 W thermal envelope. That is the only power-related number in the FACT PACK. The processor is built on a 32 nm process by GlobalFoundries, with 1,178 million transistors and a die size of 228 mm². Those process and die details provide context for the thermal class, but the TDP is the direct thermal specification. A 100 W TDP implies that the cooling solution should be designed for a desktop CPU of that dissipation class. The absence of integrated graphics also means the 100 W figure applies to the CPU side alone; any separate graphics card would add its own thermal load.

Because the multiplier is unlocked, the processor can be run at changed multiplier settings. The thermal outcome of doing so is not recorded in the FACT PACK. No overclocked frequency or overclocked power number appears in the record. Therefore, the only safe thermal statement is that the processor is a 100 W part, and the cooling tier should match that 100 W envelope. The 32 nm node and the 228 mm² die are the available manufacturing context, and the data gives no reason to place the processor in a low-power thermal class. Builders should use a cooler rated for a 100 W-class CPU and ensure the surrounding system can handle the heat from the CPU plus any discrete graphics solution.