CPU Comparison

The AMD Opteron 4386 and Intel Core i7-950 land on identical average benchmark scores of 957, placing both at the 26th percentile among all CPUs. This parity is striking given how differently each chip is constructed, and the head-to-head data shows a series of near-photographic finishes. The Opteron 4386 takes all five benchmark wins, but the margins are razor-thin: in Cinebench R15 multicore, both score exactly 280 with a delta of 0%. In Cinebench R20 multicore, the Opteron edges ahead 1168 to 1167, a 0.1% difference. Single-core results are equally tight, with both chips scoring 164 in R20 single-core and 392 in R23 single-core, each time a 0% delta. The R23 multicore test shows the Opteron winning 2782 to 2780, another 0.1% margin. Every result in the head-to-head table lists the Opteron as the winner, yet the actual performance gap never exceeds 0.1%. This is not a contest of raw speed; it is a statistical tie dressed up as a sweep.

Head-to-Head Benchmarks

The most revealing pattern in the benchmark data is how consistently the two processors converge on identical scores. In Cinebench R15 multicore, the Opteron 4386 and i7-950 both produce 280 points, a perfect dead heat. The R20 multicore test breaks the tie by a single point, 1168 for the AMD part versus 1167 for Intel, which translates to a 0.1% delta. That single-point margin is the largest gap anywhere in the comparison. The R23 multicore test repeats the same story: the Opteron scores 2782, the i7-950 scores 2780, again a 0.1% difference. In single-core workloads, the two are indistinguishable. Cinebench R20 single-core shows 164 for both, and R23 single-core shows 392 for both, with 0% deltas in each case.

What does this mean? The Opteron 4386 wins all five head-to-head tests, but the data suggests those wins are essentially noise. A 0.1% margin in two tests and exact ties in three others is not a performance advantage; it is measurement variance. The 26th percentile ranking for both chips reinforces this, showing they sit at the same position relative to all other CPUs. The nearest rivals list also confirms the clustering: the AMD Athlon X4 870K and Intel Xeon W3550 both average 956, while the AMD Ryzen Embedded R1600 averages 958. The Opteron and i7-950 are surrounded by chips within 0.1% of their score. For anyone looking at these numbers, the conclusion is that workload performance will be dictated by software optimization and platform features, not by a meaningful difference in compute throughput.

Architecture Differences

The hardware underneath these two chips could hardly be more different, even if the benchmark scores refuse to separate. The AMD Opteron 4386 is an 8-core, 8-thread processor built on the Piledriver architecture, codenamed Seoul, using a 32 nm process node. It packs 1,200 million transistors into a 315 mm² die. The Intel Core i7-950, by contrast, is a 4-core, 8-thread part based on Nehalem, codenamed Bloomfield, fabricated on a 45 nm process. Intel’s chip uses 731 million transistors across a 263 mm² die. The Opteron has double the physical cores, yet Hyper-Threading on the i7-950 brings its thread count to 8, matching the Opteron’s native 8 threads. This is the central architectural tension: AMD relies on more cores, while Intel leans on simultaneous multithreading and higher per-core efficiency.

Cache configurations also diverge significantly. The Opteron 4386 offers 384 KB of L1 cache, 8 MB of L2, and 8 MB of shared L3. The i7-950 provides 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. With four cores, the i7-950’s per-core L2 amounts to roughly 1 MB total, far less than the Opteron’s 8 MB L2. Yet the shared L3 is identical at 8 MB. Clock speeds tell another story: the Opteron has a base clock of 3.10 GHz and a boost clock of 3.80 GHz, while the i7-950 runs at 3.07 GHz base and 3.33 GHz boost. The AMD part has the higher ceiling, but the Intel part’s 45 nm node is older and its 130 W TDP is notably higher than the Opteron’s 95 W. The Opteron also uses the AMD Socket C32 platform, whereas the i7-950 uses Intel Socket 1366. Memory support is DDR3 for both, but the i7-950 explicitly lists triple-channel memory support, while the Opteron’s memory bus is not specified in the data. The i7-950 also lists PCIe Gen 2 support, a feature absent from the Opteron’s specification sheet.

FAQ

Q: Which processor has more physical cores?

A: The AMD Opteron 4386 has 8 physical cores, while the Intel Core i7-950 has 4 physical cores. However, the i7-950 supports 8 threads via Hyper-Threading, matching the Opteron’s thread count.

Q: Are the benchmark scores really that close?

A: Yes. In the five head-to-head tests, the largest delta is 0.1%. Cinebench R15 multicore and both single-core tests show exact ties, while R20 and R23 multicore show single-point margins favoring the Opteron.

Q: Which chip has a higher boost clock?

A: The AMD Opteron 4386 boosts to 3.80 GHz, compared to the Intel Core i7-950’s boost of 3.33 GHz. The Opteron also has a slightly higher base clock at 3.10 GHz versus 3.07 GHz.

Q: How do their thermal design power ratings compare?

A: The Opteron 4386 has a TDP of 95 W, while the i7-950 has a TDP of 130 W. This means the Intel chip draws more power under load, despite having fewer physical cores.

Q: What is the production status of each chip?

A: The Intel Core i7-950 is listed as end-of-life, while the Opteron 4386 has no production status specified in the data.

Q: Do they support ECC memory?

A: Both processors list ECC memory support as false in the specification data.

Specification Differences

The two processors differ across nearly every core specification. The Opteron 4386 uses 8 cores and 8 threads, while the i7-950 uses 4 cores and 8 threads. Base clocks are 3.10 GHz versus 3.07 GHz, and boost clocks are 3.80 GHz versus 3.33 GHz. TDP is 95 W for the AMD part and 130 W for the Intel part. Sockets differ: AMD Socket C32 versus Intel Socket 1366. The architecture is Piledriver (Seoul) for AMD versus Nehalem (Bloomfield) for Intel. Manufacturing nodes are 32 nm for AMD and 45 nm for Intel. Transistor counts are 1,200 million versus 731 million, and die sizes are 315 mm² versus 263 mm². Cache layouts differ: the Opteron has 384 KB L1, 8 MB L2, and 8 MB shared L3, while the i7-950 has 64 KB L1 per core, 256 KB L2 per core, and 8 MB shared L3. The memory bus is triple-channel for Intel, but unspecified for AMD. PCIe support is Gen 2 for Intel, unspecified for AMD. The market segments differ: the Opteron targets server/workstation, while the i7-950 targets desktop. Release dates are December 2012 for the Opteron and June 2009 for the i7-950. Part numbers are OS4386WLU8KHK for AMD and SLBEN for Intel.

The Verdict

The benchmark data points to a clear but counterintuitive conclusion: these two processors are performance twins, despite their architectural differences. The Opteron 4386 wins all five head-to-head tests, but with margins of 0% or 0.1%, there is no meaningful performance difference in Cinebench workloads. The 26th percentile ranking for both chips confirms they sit in the same performance tier. For workloads that scale with physical cores, the Opteron’s 8-core design might have an edge in theory, but the benchmark results do not show it. For workloads that favor higher per-core clocks, the i7-950’s 3.33 GHz boost and Nehalem efficiency could be expected to help, but again, the data shows no such advantage. The Opteron’s lower TDP (95 W versus 130 W) is a genuine differentiator, suggesting better power efficiency per unit of performance. The i7-950’s triple-channel memory support and PCIe Gen 2 are platform-level advantages, but they do not appear in the compute benchmarks. Anyone choosing between these two should base the decision on platform requirements, power budgets, and availability, not on raw performance scores, because the scores are effectively identical.

Where Each One Wins

The Opteron 4386 wins on paper in all five Cinebench tests, but the practical takeaway is more nuanced. The AMD chip’s 8 physical cores and higher boost clock (3.80 GHz) make it the nominal winner in multicore and single-core tests alike. Its 95 W TDP also gives it a power efficiency advantage over the i7-950’s 130 W TDP, which could matter in dense server deployments where the Opteron’s server/workstation segment applies. The Opteron’s larger L2 cache (8 MB versus 1 MB total on the i7-950) might also benefit certain cache-sensitive workloads, though this is not directly measured in the provided benchmarks.

The Intel Core i7-950, despite losing every head-to-head test, offers its own strengths. Its triple-channel memory support and PCIe Gen 2 connectivity are features the Opteron does not list, making it a more complete desktop platform for users who need those capabilities. The 4-core, 8-thread configuration with Hyper-Threading achieves the same benchmark scores as the 8-core Opteron, demonstrating that Intel’s per-core efficiency offsets AMD’s core count advantage. The i7-950’s 45 nm node is older, but its 263 mm² die is smaller than the Opteron’s 315 mm², which could be relevant for thermal or spatial constraints. In the end, the data shows neither chip dominates the other in any measurable way, the wins are symbolic, not substantive. The Opteron takes the performance crown by a hair, while the i7-950 counters with platform features and a smaller physical footprint.