Intel Core i5-3570S vs Intel Core i7-8665UE Comparison

The Intel Core i7-8665UE and the Intel Core i5-3570S represent two very different eras of Intel design, one aimed at low-power mobility and the other at desktop performance. The benchmark data shows a consistent, though narrow, victory for the newer mobile part across every recorded test. The i7-8665UE wins all six head-to-head comparisons, but the margins are slim, ranging from 3.2% to 3.6%. Both processors sit at the 33rd percentile of all CPUs in the database, indicating they occupy a similar performance tier overall, despite their architectural differences. The average benchmark score for the i7-8665UE is 1193, while the i5-3570S trails slightly at 1169.

Where Each One Wins

The Intel Core i7-8665UE is the clear winner in every benchmark category recorded in the database. Its advantages are most pronounced in single-core tests, where its higher boost clock of 4.40 GHz, compared to the i5-3570S's 3.80 GHz, gives it a consistent edge. The data shows a 3.6% lead in Cinebench R15 single-core and a 3.4% lead in both Cinebench R20 and R23 single-core tests. This makes it the better choice for workloads that rely on lightly threaded performance, such as everyday application responsiveness and older software that does not scale across many cores.

In multi-core tests, the i7-8665UE also takes the lead, but the margin is slightly smaller. The presence of Hyper-Threading, giving it 8 threads versus the i5-3570S's 4, likely contributes to this advantage. It wins the Cinebench R15 multi-core test by 3.2%, R20 multi-core by 3.3%, and R23 multi-core by 3.3%. This indicates that for modern, heavily threaded applications like video encoding or 3D rendering, the i7-8665UE will be slightly faster. However, the i5-3570S still holds its own in this comparison, losing by only a few percentage points despite its much older architecture and lack of multi-threading.

The i5-3570S does not win any of the recorded head-to-head benchmarks. Its sole advantage in the data is its higher base clock of 3.10 GHz, but this does not translate into a performance win in any test. The data suggests that the i7-8665UE's higher boost clock and extra threads are more impactful than the i5-3570S's higher sustained clock speed. The i5-3570S is also the only one of the two with a Geekbench score recorded in the database, but that score is not part of the head-to-head comparison, so it cannot be used to claim a win here.

The Verdict

For a user prioritizing maximum performance in a compact, low-power system, the Intel Core i7-8665UE is the better choice. It outperforms the i5-3570S in every single benchmark test recorded in the database. Its lead is modest, but it is consistent across both single-core and multi-core workloads. The i7-8665UE also offers a significant advantage in power efficiency, with a 15-watt TDP compared to the i5-3570S's 65 watts, making it suitable for passively cooled or fanless designs. Its mobile BGA 1528 socket, however, means it is soldered to the motherboard and not upgradeable.

The Intel Core i5-3570S is a desktop processor with a 65-watt TDP and an LGA 1155 socket. It is the older design by several years, based on the 22 nm Ivy Bridge architecture. While it loses every benchmark, its performance is not far behind, and it benefits from being a socketed desktop part. The data shows it has a higher base clock and a larger die size of 133 mm², but these do not translate to a performance advantage. The i5-3570S might be preferable for someone building or upgrading a legacy desktop system, but for pure performance as measured by the database, the i7-8665UE is superior.

There is no scenario in this data where the i5-3570S wins a performance comparison. The only reason to choose it would be for platform compatibility with an existing LGA 1155 motherboard. If you are starting from scratch or can select the CPU, the i7-8665UE is the one to pick. Its wins across all six benchmarks, combined with its much lower power draw, make it the more capable and efficient processor.

Head-to-Head Benchmarks

The most significant win for the Intel Core i7-8665UE comes in the Cinebench R15 single-core test, where it scores 58 against the i5-3570S's 56, a 3.6% difference. This is the largest margin in any of the six comparisons. The boost clock of 4.40 GHz is the key factor here, as the i5-3570S can only reach 3.80 GHz. For applications that depend on a single fast core, this advantage matters.

The smallest win for the i7-8665UE is in the Cinebench R15 multi-core test, with a score of 415 versus 402, a 3.2% delta. This shows that even with its 8 threads and newer architecture, the i7-8665UE only edges out the older quad-core i5-3570S by a small amount in this older rendering benchmark. The i5-3570S's higher base clock of 3.10 GHz helps it stay competitive in this test, as it can sustain a higher frequency across all four cores.

In the Cinebench R20 and R23 suites, the margins are tighter and more consistent. The i7-8665UE scores 1732 to 1676 in R20 multi-core, a 3.3% win, and 4124 to 3991 in R23 multi-core, also a 3.3% win. Single-core results follow the same pattern, with the i7-8665UE winning by 3.4% in both R20 (244 to 236) and R23 (582 to 563). The data shows a clear pattern: the i7-8665UE is faster, but the i5-3570S is never far behind. The largest delta across all tests is just 3.6%, meaning the older chip is still within striking distance in every workload.

FAQ

Q: Which processor is faster in multi-core workloads?

A: The Intel Core i7-8665UE is faster in all recorded multi-core tests. It leads by 3.2% in Cinebench R15 (415 vs 402), 3.3% in Cinebench R20 (1732 vs 1676), and 3.3% in Cinebench R23 (4124 vs 3991).

Q: Is the Intel Core i5-3570S better in any benchmark?

A: No. The data shows the i5-3570S loses all six head-to-head comparisons. The Intel Core i7-8665UE wins every test, with deltas ranging from 3.2% to 3.6%.

Q: How much of a difference does the boost clock make?

A: The i7-8665UE has a boost clock of 4.40 GHz compared to 3.80 GHz for the i5-3570S. This contributes to its consistent single-core wins, where it is ahead by 3.4% to 3.6% across the Cinebench R15, R20, and R23 tests.

Q: Do both processors have the same number of cores?

A: Yes, both have 4 physical cores. However, the i7-8665UE supports 8 threads through Hyper-Threading, while the i5-3570S has only 4 threads.

Q: What is the power consumption difference?

A: The i7-8665UE has a TDP of 15 watts, while the i5-3570S has a TDP of 65 watts. This makes the i7-8665UE significantly more power-efficient.

Q: Which processor has more L3 cache?

A: The i7-8665UE has 8 MB of shared L3 cache, while the i5-3570S has 6 MB of shared L3 cache.

Architecture Differences

The two processors come from different architectural generations and manufacturing processes. The Intel Core i7-8665UE is built on the 14 nm process node and uses the Whiskey Lake architecture, specifically the Whiskey Lake-U codename. The Intel Core i5-3570S is an older design based on the 22 nm process node and uses the Ivy Bridge architecture. This generational gap explains some of the performance differences, as the newer 14 nm process allows for higher clock speeds and better power efficiency.

The memory support also differs. The i7-8665UE supports both DDR3 and DDR4 memory, while the i5-3570S only supports DDR3. Both use a dual-channel memory bus, but the i7-8665UE has a recorded memory bandwidth of 38.4 GB/s, while no bandwidth figure is available for the i5-3570S. The integrated graphics are also different, with the i7-8665UE featuring UHD Graphics 620 and the i5-3570S featuring Intel HD 2500.

The production status and release dates show a clear timeline. The i7-8665UE was released in September 2018 and is marked as end-of-life. The i5-3570S was released in May 2012, and its production status is not recorded. The i7-8665UE is a mobile processor, while the i5-3570S is a desktop processor, which explains their different sockets and power targets.

Specification Differences

The most important specification difference is the socket. The Intel Core i7-8665UE uses Intel BGA 1528, meaning it is soldered to the motherboard. The Intel Core i5-3570S uses Intel Socket 1155, which is a standard LGA socket that allows for CPU swapping. This makes the i5-3570S a more flexible option for repairs or upgrades on an existing desktop platform.

Clock speeds differ significantly. The i7-8665UE has a base clock of 1700.00 MHz and a boost clock of 4.40 GHz. The i5-3570S has a base clock of 3.10 GHz and a boost clock of 3.80 GHz. Despite the i5-3570S's much higher base clock, the i7-8665UE's higher boost clock and newer architecture give it the performance edge in the benchmarks.

Thread count is another key difference. The i7-8665UE has 8 threads due to Hyper-Threading, while the i5-3570S has 4 threads. The TDP also differs dramatically: 15 watts for the i7-8665UE versus 65 watts for the i5-3570S. The cache sizes are 8 MB L3 for the i7-8665UE and 6 MB L3 for the i5-3570S. The i5-3570S has a recorded die size of 133 mm², while no die size is listed for the i7-8665UE. The i7-8665UE has a launch MSRP of $409, while no launch MSRP is recorded for the i5-3570S. Both processors use PCIe Gen 3 with 16 lanes (CPU only), and neither supports ECC memory or has an unlocked multiplier.