AMD Phenom II X4 945 (125W)

The AMD Phenom II X4 945 (125W) is a desktop processor from the K10 architecture family, codenamed Deneb. Released on April 22, 2009, this part has reached end-of-life status. The chip contains 4 cores and 4 threads, operating at a fixed base clock of 3.00 GHz with no boost clock. Built on a 45 nm process, it integrates 758 million transistors across a 258 mm² die. In the benchmark database, this processor holds a percentile rank of 50 among all CPUs, yet its average benchmark score is listed as 0, indicating that no specific performance runs are recorded for this entry.

Single-Thread vs Multi-Thread Behavior

The absence of a boost clock is the most defining feature of this chip's behavior. With a fixed base clock of 3.00 GHz, every workload, whether single-threaded or multi-threaded, runs at the same frequency. This is a stark contrast to modern processors that dynamically adjust clock speeds. The 4 cores and 4 threads mean that multi-threaded scaling is strictly limited to physical cores; there is no simultaneous multithreading to extract extra parallelism. The cache hierarchy consists of 128 KB of L1 and 512 KB of L2 per core, plus a shared 6 MB L3 cache.

For real-world workloads, this means that lightly threaded applications, such as older games or legacy office software, will run at the full 3.00 GHz. Heavily threaded applications, like video encoding or 3D rendering, will utilize all 4 cores, but the lack of extra threads means the scaling is directly tied to the physical core count. The 50th percentile placement suggests that in the database's historical context, this chip sits exactly at the median of performance. The data implies that single-thread performance is fixed and predictable, while multi-thread performance is entirely dependent on the 4 physical cores. The shared 6 MB L3 cache helps to mitigate the latency of the DDR3 memory subsystem, which is crucial because the fixed clock cannot compensate for memory stalls. This design favors workloads that can be cleanly parallelized across exactly 4 threads, but it leaves performance on the table for any application that could benefit from higher single-thread frequency.

Power and Thermals

The TDP of this processor is 125 W. This is a significant thermal envelope, placing it in a class that requires a capable air cooler. The 45 nm process node is relatively large by modern standards, and with 758 million transistors on a 258 mm² die, the power density is a direct result of this older manufacturing technology. Because the clock speed is fixed at 3.00 GHz without a boost state, the power draw is consistent under sustained load. This predictability can be an advantage for system builders who need to manage thermals in a small form factor, though the 125 W TDP still demands adequate airflow.

The presence of ECC memory support is notable, as it typically indicates a memory controller designed for reliability, which may slightly influence power characteristics. The data shows a part that runs at a constant rate, so cooling solutions must be sized for the maximum sustained load of 125 W. The transistor count of 758 million and the die size of 258 mm² give a sense of the physical scale, but the thermal behavior is dominated by the 125 W envelope. This is not a low-power part; it requires a dedicated cooling solution that can dissipate heat continuously. The lack of a boost clock means there are no thermal spikes from frequency transitions, which can simplify thermal management in a well-ventilated chassis.

Benchmark Performance

The benchmark data for this processor is notably sparse. The average benchmark score is recorded as 0, and the percentile vs all CPUs is 50. The percentile of 50 places this chip at the exact midpoint of the database's CPU population. This is a strong statistical signal that, in aggregate, it performs at a median level. However, the average score of 0 is unusual. It suggests that either no benchmark runs have been submitted for this specific SKU, or the database has not aggregated any scores for it.

Without any nearestRivals data, there are no deltaPct values to compare against direct competitors. The performance characteristics must therefore be inferred from the raw specifications: a 3.00 GHz base clock, 4 cores, and a 6 MB shared L3 cache. The fixed clock speed means that the processor does not have the ability to boost above 3.00 GHz, which would limit its peak single-thread performance compared to parts with a boost feature. The 50th percentile indicates that despite the lack of recorded scores, the database's classification places it at the median, meaning it is neither a high-end nor a low-end part in the historical context. The 4 cores at 3.00 GHz would provide a balanced throughput for applications that can utilize all threads, but the absence of a boost clock caps the ceiling for latency-sensitive tasks. The data implies that this processor is a dependable, mid-tier workhorse, but it will not excel in scenarios that demand high peak frequencies.

FAQ

Q: What is the base clock speed of the AMD Phenom II X4 945 (125W)?

A: The base clock speed is 3.00 GHz.

Q: Does this processor have a boost clock?

A: No, the data lists no boost clock, so it runs at a constant 3.00 GHz.

Q: How much L3 cache does it have?

A: It has 6 MB of shared L3 cache.

Q: What type of memory does it support?

A: It supports DDR3 memory with a dual-channel bus and a bandwidth of 21.3 GB/s.

Q: Does it support ECC memory?

A: Yes, ECC memory is supported.

Q: What is the TDP of this chip?

A: The TDP is 125 W.

How It Compares

The nearestRivals field in the data is empty, meaning the database does not list any direct competitors for this processor. Consequently, there are no specific rival names or deltaPct values to analyze. The only comparative metric available is the percentileVsAllCpus of 50, which indicates that this chip sits at the 50th percentile of all CPUs in the database. This is a median position, implying that an equal number of CPUs in the database are faster and slower. The lack of rival data forces a reliance on the absolute specifications. The 4 cores at 3.00 GHz, paired with a 6 MB L3 cache, define its performance envelope. The release date of April 22, 2009, and its end-of-life status indicate it belongs to an older generation. Without rival data, the analysis must conclude that this part is a median performer, with no direct comparisons available in the current dataset.

Platform and Compatibility

This processor uses the AMD Socket AM3. It supports DDR3 memory through a dual-channel memory bus, providing a memory bandwidth of 21.3 GB/s. ECC memory is supported, which is a feature often found in workstation or server platforms, but this is a desktop segment part. The PCIe interface is Gen 2. The processor does not have integrated graphics on the chip itself; instead, integrated graphics are available on certain motherboards as a chipset feature. This means a discrete graphics card is required for display output. The part number is HDX945FBK4DGIHDX945FBGIBOX. As an end-of-life product, the upgrade path is limited to other AM3 socket processors, but the data does not specify which ones. The platform is therefore defined by the AM3 socket, DDR3 memory support, and PCIe Gen 2 connectivity. The dual-channel memory bus with 21.3 GB/s bandwidth is a fixed constraint that will affect all workloads, and the ECC support adds a layer of reliability that is uncommon for a desktop part.

Who Should Consider It

Given its 50th percentile ranking, this processor is a median performer. For gaming, the 4 cores at 3.00 GHz will handle older titles and less demanding modern games, but the lack of a boost clock means it cannot dynamically increase performance for lightly-threaded games. For content creation, the 4 threads limit parallel processing, making it suitable for light video editing or image processing but not for heavy multi-threaded rendering. For office applications, the 3.00 GHz clock and 4 cores provide sufficient responsiveness for word processing, spreadsheets, and web browsing. The ECC memory support is a unique feature for a desktop part, making it a candidate for a low-cost home server or a small business workstation where data integrity is prioritized over raw speed. Because it is end-of-life, it is primarily suited for legacy systems or upgrades on existing AM3 motherboards. The 125 W TDP means that any system using this chip must have adequate cooling. The data suggests a balanced, mid-range processor that is best suited for general-purpose computing and light multi-threaded workloads, with the added benefit of ECC support for reliability-focused builds.