AMD Opteron 3365 vs Intel Core i7-8665UE Comparison

The AMD Opteron 3365 and Intel Core i7-8665UE land nearly on top of each other in aggregate performance, with average benchmark scores of 1194 and 1193 respectively. Yet their underlying designs could hardly be more different: an 8-core server chip built on 32nm K10 architecture facing a 4-core, 8-thread mobile processor on 14nm Whiskey Lake. The head-to-head data shows a clear overall winner, but the margin is consistent and worth examining closely.

Head-to-Head Benchmarks

The Intel Core i7-8665UE wins all five head-to-head Cinebench comparisons, and the margin is remarkably uniform across every test. In Cinebench R15 multicore, the Intel part scores 415 against the Opteron’s 349, a delta of -15.9% from the AMD chip’s perspective. That same -15.9% delta appears in Cinebench R20 multicore (1732 vs 1457) and Cinebench R23 multicore (4124 vs 3470). The single-core results tell the same story with slightly larger gaps: the i7-8665UE leads by 16% in both Cinebench R20 single-core (244 vs 205) and Cinebench R23 single-core (582 vs 489).

What is striking is the consistency. The Intel chip’s advantage does not shrink or grow meaningfully as the workload scales from single-threaded to multi-threaded. In R23, the multicore delta is -15.9% and the single-core delta is -16%, nearly identical. This suggests the performance gap is not about core count or threading efficiency, but rather about per-core throughput. The Opteron 3365 has twice the physical cores (8 vs 4) and the same thread count (8 vs 8), yet it still trails by roughly 16% in every scenario. The i7-8665UE’s higher boost clock of 4.40 GHz, compared to the Opteron’s 3.30 GHz, likely drives much of this, though the architectural differences between K10 and Whiskey Lake play a role as well.

The aggregate benchmark averages confirm how close these parts are in overall standing. The Opteron 3365’s average score of 1194 puts it 0.1% ahead of the i7-8665UE’s 1193, a negligible difference. Both chips sit at the 33rd to 34th percentile of all CPUs, meaning they are statistically indistinguishable in the broader landscape. The nearest rivals for both include the Intel Core i3-4170 (avg 1193) and AMD Athlon PRO 300U (avg 1193), further reinforcing that these two processors occupy the same performance tier despite their very different architectures.

Where Each One Wins

The Intel Core i7-8665UE wins every benchmark where both were tested, so the use-case split is not about raw performance — it is about everything else around the silicon. The i7-8665UE is designed for mobile platforms, with a 15W TDP that makes it suitable for thin-and-light laptops and fanless or low-noise designs. Its integrated UHD Graphics 620 means a discrete GPU is unnecessary for basic display output, and its PCIe Gen 3 support with 16 lanes (CPU only) provides modern connectivity. The Opteron 3365 cannot match any of this on paper.

The AMD Opteron 3365’s strengths lie in its server/workstation pedigree. It uses the AMD Socket AM3+ platform, which historically supports registered and ECC memory configurations on appropriate motherboards — though the fact pack lists ECC memory as false for this specific part. Its 8 physical cores, while slower per-thread, can handle more concurrent threads than the i7-8665UE’s 4 cores, assuming the workload scales across cores. The Opteron also supports DDR3 memory with a dual-channel bus, which is older but potentially cheaper to populate in legacy systems.

For real-world selection, the data suggests the i7-8665UE is the better choice for any single-socket, power-constrained application — which includes most laptops and compact desktops. The Opteron 3365 makes sense only in a context where the AM3+ platform, server-grade features, or the 8-core count is a hard requirement, and where the 16% performance deficit is acceptable.

FAQ

Q: Which CPU has the higher multi-core performance?

A: The Intel Core i7-8665UE. In Cinebench R23 multicore, it scores 4124 against the AMD Opteron 3365’s 3470, a 15.9% advantage. The same 15.9% margin appears in Cinebench R15 multicore (415 vs 349) and R20 multicore (1732 vs 1457).

Q: How do the single-core scores compare?

A: The i7-8665UE leads by 16% in both Cinebench R20 single-core (244 vs 205) and Cinebench R23 single-core (582 vs 489). The Opteron 3365 has no single-core Cinebench R15 result in the data, so the comparison is limited to R20 and R23.

Q: Are these CPUs in the same performance class overall?

A: Yes. The Opteron 3365 has an average benchmark score of 1194 and the i7-8665UE scores 1193, a 0.1% difference. Both sit near the 33rd percentile of all CPUs, and both are within 0.2% of the AMD Ryzen Embedded V1605B (avg 1196) and Intel Core i3-4170 (avg 1193).

Q: Which chip has more cores?

A: The AMD Opteron 3365 has 8 cores, while the Intel Core i7-8665UE has 4 cores. Both support 8 threads total, so the Opteron’s core count advantage does not translate into a thread count advantage.

Q: What is the TDP difference?

A: The Opteron 3365 has a 65W TDP, while the i7-8665UE is rated at 15W. This makes the Intel part far better suited to mobile or low-power designs.

Q: Does either chip include integrated graphics?

A: The i7-8665UE includes UHD Graphics 620. The Opteron 3365 does not have integrated graphics in the traditional sense; the fact pack notes it relies on a chipset feature on certain motherboards.

Specification Differences

The two processors diverge sharply on almost every specification. The Opteron 3365 uses 8 cores and 8 threads, while the i7-8665UE uses 4 cores and 8 threads. Base clocks are listed as 2.30 GHz for the AMD part and 1700.00 MHz for the Intel part, though the Intel chip’s boost clock of 4.40 GHz far exceeds the Opteron’s 3.30 GHz. TDP is a major differentiator: 65W for the Opteron versus 15W for the i7-8665UE.

Sockets are incompatible — AMD Socket AM3+ versus Intel BGA 1528 — meaning platform choice dictates which CPU is even an option. Memory support differs: the Opteron uses DDR3 only, while the i7-8665UE supports both DDR3 and DDR4. The Intel part also has higher memory bandwidth at 38.4 GB/s versus 29.9 GB/s for the AMD chip. PCIe generations differ as well, with the Opteron on Gen 2 and the i7-8665UE on Gen 3 with 16 lanes (CPU only). Neither chip has an unlocked multiplier. The i7-8665UE has a launch MSRP of $409; the Opteron 3365 has no listed launch MSRP.

Architecture Differences

The Opteron 3365 is built on AMD’s K10 architecture with the codename “Delhi,” part of the Opteron 3000 series. It uses a 32nm process from GlobalFoundries, with 1,200 million transistors on a 315 mm² die. Cache is split as 384 KB L1, 4 MB L2, and 8 MB shared L3. This is a server/workstation part that has reached end-of-life status.

The i7-8665UE is a Whiskey Lake-U part, using Intel’s 14nm process. Its cache structure is per-core: 64 KB L1 per core, 256 KB L2 per core, and 8 MB shared L3. It is a mobile-focused chip, also end-of-life, but from a much newer generation (released 2018-09-30). The Intel part supports both DDR3 and DDR4, whereas the Opteron is limited to DDR3. The i7-8665UE includes integrated UHD Graphics 620, which the Opteron lacks, and its PCIe Gen 3 support is a step ahead of the Opteron’s Gen 2. The Opteron’s die size and transistor count are known, but the Intel chip’s die size and transistor count are not listed. Neither chip supports ECC memory according to the fact pack, and both are end-of-life products.

The Verdict

The benchmark data is unambiguous: the Intel Core i7-8665UE outperforms the AMD Opteron 3365 by roughly 16% across every Cinebench workload, from single-core R20 to multicore R23. The i7-8665UE also does this while consuming 15W versus 65W, supporting newer memory standards, and including integrated graphics. For anyone building a compact, power-efficient system — or upgrading a laptop — the i7-8665UE is the clear choice based on performance and platform features.

The Opteron 3365’s case rests on its 8 physical cores and server-oriented AM3+ platform. In workloads that are heavily thread-count dependent and where the 16% per-core deficit does not matter, the Opteron could theoretically hold its own, but the data shows it loses even in multicore tests. The fact that both chips have identical thread counts (8) removes the Opteron’s main leverage point.

Choose the i7-8665UE for better performance, lower power draw, and modern platform support. Choose the Opteron 3365 only if you are locked into an AM3+ motherboard and need a server-class CPU with 8 physical cores, accepting the slower benchmark results. Given the i7-8665UE’s launch MSRP of $409 and the Opteron’s lack of a listed price, the Intel part is also the only one with a defined retail expectation. For nearly every practical purpose, the i7-8665UE is the better processor.