Intel Core i3-8121U vs Intel Core i7-3610QM Comparison

The Verdict

The Intel Core i7-3610QM and Intel Core i3-8121U target completely different mobile use cases, and the benchmark data reflects that divide. The i7-3610QM wins 6 of the 8 head-to-head comparisons, dominating in every Cinebench test (R15, R20, and R23) across both single-core and multi-core workloads. Its multi-core advantage is consistent and substantial: it leads by 20.2% in Cinebench R15, R20, and R23 multi-core tests alike. The i3-8121U, however, strikes back decisively in Geekbench, winning both the multi-core test by 17.3% and the single-core test by a massive 53.3%.

For sustained rendering and CPU-heavy productivity workloads, the i7-3610QM is the clear choice, as its 4 cores and 8 threads deliver a 20%+ advantage across every Cinebench iteration. For users prioritizing Geekbench-style integer and floating-point performance, particularly in single-threaded scenarios, the i3-8121U is dramatically faster. The i7-3610QM also holds a slight edge in average benchmark score (1244 vs. 1209), though both chips sit at the 34th percentile of all CPUs, indicating they are mid-pack performers overall. Neither chip is unlocked, so overclocking is not a factor in the decision. The i7-3610QM carries a launch MSRP of $378; the i3-8121U has no listed launch MSRP in the database.

Architecture Differences

The architectural gap between these two mobile processors is generational. The i7-3610QM is built on Intel's Ivy Bridge architecture using a 22 nm process node, while the i3-8121U uses Cannon Lake on a 10 nm node. That process shrink is significant, but it does not translate into a performance advantage for the newer chip in most tests.

Core and thread counts differ sharply. The i7-3610QM offers 4 physical cores with 8 threads via Hyper-Threading. The i3-8121U is a 2-core, 4-thread part. This explains the older chip's multi-core dominance in Cinebench. The i7-3610QM also has more shared L3 cache at 6 MB compared to 4 MB on the i3-8121U. Both chips feature 64 KB of L1 cache per core and 256 KB of L2 cache per core.

Clock speeds are close. The i7-3610QM has a 2.30 GHz base clock and a 3.30 GHz boost clock. The i3-8121U runs at 2.20 GHz base and 3.20 GHz boost. Despite the newer architecture and nearly identical clocks, the i3-8121U only wins in Geekbench, suggesting the Cannon Lake architecture has strengths in certain workloads that Ivy Bridge does not.

Memory support differs by generation. The i7-3610QM supports DDR3 memory with dual-channel access and a memory bandwidth of 25.6 GB/s. The i3-8121U supports DDR4 with dual-channel access and a higher memory bandwidth of 38.4 GB/s. Neither chip supports ECC memory. Both provide PCIe Gen 3 with 16 lanes from the CPU.

Integrated graphics also split the two. The i7-3610QM includes Intel HD 4000 graphics. The i3-8121U has no integrated graphics at all, meaning a discrete GPU is mandatory for any display output. The i7-3610QM uses the Intel Socket G2 (988B), while the i3-8121U uses Intel BGA 1440. The transistor count for the i7-3610QM is 1,400 million on a 160 mm² die. The i3-8121U has no transistor count listed but uses a much smaller 70.52 mm² die.

Both processors are end-of-life mobile parts. The i7-3610QM was released in April 2012; the i3-8121U followed in May 2018. The i3-8121U's 15 W TDP is notably more power-efficient than the i7-3610QM's 45 W TDP, a difference that matters in thin-and-light laptops.

Head-to-Head Benchmarks

The data paints a clear picture of split strengths. In Cinebench R15 multi-core, the i7-3610QM scores 440 versus 366 for the i3-8121U, a 20.2% advantage. Single-core R15 shows 62 versus 51, a 21.6% lead for the i7. The pattern holds in Cinebench R20: multi-core scores are 1836 versus 1527 (20.2% ahead), and single-core is 259 versus 215 (20.5% ahead). Cinebench R23 repeats the same story with multi-core at 4373 versus 3637 (20.2%) and single-core at 617 versus 513 (20.3%).

The i3-8121U's wins come exclusively in Geekbench. In the multi-core test, it scores 2215 against the i7-3610QM's 1831, a 17.3% margin. The single-core Geekbench result is even more lopsided: 1149 versus 537, giving the i3-8121U a 53.3% advantage. That single-core gap is the largest delta of any test in the comparison.

These results suggest the i7-3610QM's older architecture is better optimized for Cinebench's rendering engine, which scales well with the additional cores and threads. The i3-8121U's Cannon Lake design, meanwhile, excels in Geekbench's workload mix, particularly in single-threaded execution where its architectural improvements over Ivy Bridge show through.

Looking at the nearest rivals in the database, the i7-3610QM sits within a narrow band of comparable chips. It is 0.7% ahead of both the Intel Pentium Gold G6600 and the Intel Core i3-8109U, and 1% ahead of the Intel Xeon E3-1235L v5. The Intel Core i3-7100T is 1.1% ahead of it. The i3-8121U's nearest rivals include the Intel Xeon D-1520 at a 0% delta, the Intel Xeon E5645 at 0.1% behind, the Intel Xeon D-1527 at 0.1% ahead, and the Intel Core i3-7300T at 0.1% ahead. Both chips are essentially average performers relative to their closest competition.

FAQ

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

A: The Intel Core i7-3610QM wins all three Cinebench multi-core tests by exactly 20.2%. It scores 440 in R15, 1836 in R20, and 4373 in R23, versus 366, 1527, and 3637 for the i3-8121U respectively.

Q: Does the newer i3-8121U have any performance advantage?

A: Yes, it wins both Geekbench tests. It scores 2215 in multi-core versus 1831 for the i7-3610QM (a 17.3% lead), and 1149 in single-core versus 537 (a 53.3% lead).

Q: What are the core and thread counts for each chip?

A: The i7-3610QM has 4 cores and 8 threads. The i3-8121U has 2 cores and 4 threads.

Q: Do these processors have integrated graphics?

A: The i7-3610QM includes Intel HD 4000 integrated graphics. The i3-8121U has no integrated graphics, so it requires a discrete GPU for display output.

Q: What memory types do they support?

A: The i7-3610QM supports DDR3 with dual-channel access and 25.6 GB/s of bandwidth. The i3-8121U supports DDR4 with dual-channel access and 38.4 GB/s of bandwidth.

Q: How do their power consumption figures compare?

A: The i7-3610QM has a 45 W TDP, while the i3-8121U has a 15 W TDP. The i3-8121U is significantly more power-efficient.

Where Each One Wins

The i7-3610QM is the winner for multi-threaded, CPU-intensive workloads. Its 4 cores and 8 threads, combined with 6 MB of L3 cache, deliver a consistent 20% lead across all Cinebench variants. This makes it the better choice for rendering tasks, video encoding, compiling code, or any sustained workload that can use more than two cores. The 45 W TDP indicates it belongs in larger laptops with active cooling, not ultraportables. If the workload is Cinebench-style rendering, the i7-3610QM is decisively ahead.

The i3-8121U wins in Geekbench, and its single-core margin is enormous. The 53.3% lead in Geekbench single-core suggests that applications with heavy single-threaded logic, such as certain productivity tools, web browsing with complex JavaScript, or light gaming that relies on one dominant thread, will feel noticeably snappier on the i3-8121U. Its higher memory bandwidth (38.4 GB/s versus 25.6 GB/s) also helps in memory-sensitive workloads. The 15 W TDP makes it far better suited for thin-and-light devices where battery life and thermals are priorities. The lack of integrated graphics is a drawback, but for systems that pair the chip with a discrete GPU, the performance-per-watt profile is attractive.

In the broader context of the database, both chips are mid-pack performers at the 34th percentile. The i7-3610QM's average benchmark score of 1244 puts it just ahead of the i3-8121U's 1209, but the gap is small. The real differentiator is workload type: Cinebench favors the i7-3610QM, Geekbench favors the i3-8121U. Users who need multi-core rendering muscle should choose the i7-3610QM. Users who prioritize single-thread responsiveness and power efficiency, and can accept the need for a discrete GPU, should choose the i3-8121U. There is no universal winner, only the right tool for the job.