CPU Comparison

The Intel Core i3-8300 and AMD Opteron 6276 are separated by seven years, two process nodes, and a fundamental philosophical divide in CPU design. Yet, when the benchmark data is laid side by side, the two chips land within a hair's breadth of each other in average score, 1564 for the Intel part versus 1560 for the AMD server processor. The Core i3-8300 wins all six head-to-head Cinebench tests, but the margins are razor-thin, ranging from 0.2% to 0.4%. This is not a generational rout; it is a statistical tie that reveals how far AMD's Bulldozer architecture pushed multi-threaded throughput, and how effectively Intel's Coffee Lake silicon closed the gap with far fewer physical resources.

Head-to-Head Benchmarks

The largest victory for the Intel Core i3-8300 comes in Cinebench R15 multi-core, where it scores 545 against the Opteron's 543, a 0.4% advantage. That margin is the only test where the delta exceeds 0.3%. In Cinebench R20 multi-core, the Intel chip posts 2271 versus 2265, a 0.3% lead. The R23 multi-core test shows a similar pattern: 5408 for the Core i3-8300, 5395 for the Opteron, a 0.2% gap. These multi-core results are remarkable given that the Opteron 6276 packs 16 physical cores against the Intel's 4 cores and 4 threads.

Single-core performance tells a nearly identical story. In Cinebench R15 single-core, both processors score exactly 76, with the Intel part declared the winner by a 0% delta, a dead heat. Cinebench R20 single-core sees the Core i3-8300 edge ahead 320 to 319, a 0.3% lead. The R23 single-core test repeats that 0.3% margin, with scores of 763 and 761. The Intel chip's single-core advantage is consistent but negligible in absolute terms; the Opteron's 2.30 GHz base clock and 3.20 GHz boost clock are clearly sufficient to keep pace with the Core i3-8300's 3.70 GHz fixed clock in these workloads. The data shows a clean sweep for Intel, 6 wins, 0 losses, but every win is measured in fractions of a percent.

Architecture Differences

The architectural chasm between these two processors is the story behind the numbers. The Intel Core i3-8300 is built on a 14 nm process at Intel's foundry, with a die size of 126 mm². It features 4 cores and 4 threads, with a base clock of 3.70 GHz and no boost clock. The cache hierarchy is straightforward: 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3 cache. It supports DDR4 memory over a dual-channel bus, delivering 38.4 GB/s of bandwidth. The chip includes integrated UHD Graphics 630 and uses PCIe Gen 3 with 16 CPU lanes. Its TDP is 62 watts.

The AMD Opteron 6276 is a fundamentally different beast. Built on GlobalFoundries' 32 nm process, it uses two dies totaling 2x 315 mm², with 2,400 million transistors. It offers 16 cores and 16 threads, clocked at 2.30 GHz base and 3.20 GHz boost. The cache layout is module-based: 768 KB of L1, 2 MB of L2 per module, and 8 MB of L3 per die. It supports DDR3 over a quad-channel bus, which yields a higher memory bandwidth of 51.2 GB/s, nearly 33% more than the Intel part. The Opteron uses PCIe Gen 2, has no integrated graphics, and carries a 115 watt TDP. It targets the server/workstation segment, while the Core i3-8300 is a desktop part. Both support ECC memory, and both are end-of-life products, but their release dates are separated by over six years, the Opteron launched in November 2011, the Core i3-8300 in February 2018.

The Bulldozer architecture in the Opteron uses shared floating-point units and clustered integer cores, which explains how 16 cores can match a modern 4-core chip in threaded workloads. The Coffee Lake architecture in the Intel part relies on higher per-core efficiency and a newer process node. The result is that the Opteron needs 4x the cores and nearly double the TDP to achieve parity, while the Intel chip delivers the same throughput with a fraction of the silicon.

Where Each One Wins

The benchmark sweep gives the Intel Core i3-8300 the categorical edge in every Cinebench test, but the story is more nuanced for real-world usage. The Intel part wins all six head-to-head comparisons, but the margins are so small that neither chip can claim a decisive performance advantage in these specific workloads. Where the Core i3-8300 clearly wins is in platform efficiency: a 62 watt TDP versus 115 watts, a single-die design versus dual-die, and integrated graphics versus none. For desktop users, the Core i3-8300 offers a complete, low-power package with UHD Graphics 630 and DDR4 support.

The Opteron 6276 wins on raw resource count and server-oriented features. Its 16 cores and 16 threads provide more parallel headroom for heavily threaded server workloads that scale beyond Cinebench's scope. Its quad-channel DDR3 memory bus delivers 51.2 GB/s of bandwidth, 33% more than the Intel chip's 38.4 GB/s, which can benefit memory-bound server tasks. The Opteron also offers PCIe Gen 2 connectivity and a larger aggregate cache footprint (16 MB of L3 across two dies, plus 2 MB of L2 per module). For a server/workstation environment where multi-threaded throughput and memory bandwidth matter more than single-core latency, the Opteron's design philosophy holds merit, even if its benchmark scores do not reflect a win.

In contrast, the Core i3-8300's wins in Cinebench R15, R20, and R23, both single and multi-core, indicate it handles general-purpose compute with less overhead. The data suggests that for desktop productivity, light content creation, and everyday multitasking, the Intel part achieves the same results as the Opteron with a fraction of the power draw. The Opteron's advantage would only materialize in workloads that exploit its 16 threads and higher memory bandwidth, which are not represented in these Cinebench results.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Core i3-8300 has an average benchmark score of 1564, while the AMD Opteron 6276 scores 1560. The difference is 4 points, or roughly 0.3%.

Q: How do the two chips compare in Cinebench R23 multi-core?

A: The Intel Core i3-8300 scores 5408, and the AMD Opteron 6276 scores 5395. The Intel part wins by 0.2%.

Q: What is the core and thread count difference?

A: The AMD Opteron 6276 has 16 cores and 16 threads. The Intel Core i3-8300 has 4 cores and 4 threads. Despite having 4x the cores, the Opteron trails in every benchmark.

Q: Do both processors support ECC memory?

A: Yes, both the Intel Core i3-8300 and the AMD Opteron 6276 have ECC memory support enabled.

Q: What are the memory bandwidth specifications for each?

A: The AMD Opteron 6276 supports quad-channel DDR3 with 51.2 GB/s bandwidth. The Intel Core i3-8300 supports dual-channel DDR4 with 38.4 GB/s bandwidth.

Q: Which processor has integrated graphics?

A: Only the Intel Core i3-8300 has integrated graphics, specifically UHD Graphics 630. The AMD Opteron 6276 does not include any integrated GPU.

Specification Differences

The two processors differ in nearly every measured specification. The Intel Core i3-8300 has 4 cores and 4 threads, while the AMD Opteron 6276 has 16 cores and 16 threads. The Intel chip runs at a fixed 3.70 GHz base clock with no boost, whereas the Opteron runs at 2.30 GHz base and boosts to 3.20 GHz. TDP is 62 watts for Intel versus 115 watts for AMD. The Intel part uses a 14 nm process with a 126 mm² die; the AMD part uses 32 nm with two 315 mm² dies and 2,400 million transistors. Cache configurations differ as well: Intel has 64 KB L1 per core and 256 KB L2 per core, while AMD has 768 KB L1 total and 2 MB L2 per module. L3 is 8 MB shared on Intel, versus 8 MB per die on AMD.

Memory support splits along generations: Intel uses DDR4 with dual-channel access at 38.4 GB/s, while AMD uses DDR3 with quad-channel access at 51.2 GB/s. PCIe connectivity is Gen 3 with 16 lanes on Intel, versus Gen 2 on AMD. The Intel part includes UHD Graphics 630; the AMD part has no integrated graphics. Sockets are incompatible: Intel Socket 1151 versus AMD Socket G34. Market segments differ, Desktop for Intel, Server/Workstation for AMD. Release dates are February 2018 for the Core i3-8300 and November 2011 for the Opteron 6276. The launch MSRP for the Intel part is $138; the AMD part launched at $788. Both are end-of-life, both have locked multipliers, and both support ECC memory. The part numbers are SR3XY for Intel and OS6276WKTGGGU for AMD.