Intel Core i7-5775R vs Intel Core i7-8705G Comparison

These two Intel processors, the Core i7-8705G and the Core i7-5775R, represent different eras of Intel's design philosophy. The 8705G is a mobile-first Kaby Lake part, while the 5775R is a desktop Broadwell chip with a rich integrated GPU. The benchmark data shows a close contest, with the newer 8705G taking the majority of wins, but the older 5775R holding a notable advantage in one key test. Both are 4-core, 8-thread parts with a 65 W TDP, but their underlying architectures and platform features set them apart in practical use.

Where Each One Wins

The recorded data paints a clear picture of two distinct strengths. The Intel Core i7-8705G is the stronger CPU in nearly every compute-focused benchmark. It wins 7 of the 8 head-to-head tests, with its largest victory coming in Geekbench single-core, where it posts a score of 1277 against the 5775R's 1218. That is a 4.8% advantage, the biggest margin recorded between the two. Its lead in Cinebench tests is consistent, ranging from 1.1% to 1.9% depending on the workload. This makes the 8705G the default pick for general application performance, lightly threaded tasks, and Cinebench-style rendering workloads.

The Intel Core i7-5775R, however, wins the Geekbench multicore test. It scores 3996 against the 8705G's 3968, a 0.7% margin in its favor. This is the only head-to-head test the 5775R wins, but it signals that its older Broadwell architecture can still keep pace in a specific multithreaded scenario. Beyond the benchmark suite, the 5775R also differs in platform scope. It is a desktop part with a BGA 1364 socket and 16 PCIe Gen 3 lanes, while the 8705G is a mobile part with a BGA 2270 socket and only 8 lanes. For a builder looking at a fixed desktop system, the 5775R offers more CPU-direct PCIe connectivity out of the box.

The 5775R also carries a 6 MB shared L3 cache, compared to 8 MB on the 8705G, and uses DDR3 memory with 29.9 GB/s bandwidth. The 8705G, in contrast, uses DDR4 memory.

Architecture Differences

The two CPUs share the same 14 nm process node and both use Intel's 64 KB L1 cache per core and 256 KB L2 cache per core. Both are end-of-life products with locked multipliers. The architecture split begins with the microarchitecture: the 8705G is built on Kaby Lake, specifically the Kaby Lake G codename, while the 5775R is Broadwell from the Broadwell generation. This generation gap explains most of the benchmark deltas.

The memory support differs significantly. The 8705G supports DDR4 memory over a dual-channel bus with 38.4 GB/s bandwidth. The 5775R is limited to DDR3 memory, also over dual-channel, with 29.4 GB/s bandwidth. The memory bus is dual-channel on both CPUs. The die size tells the physical story as well: the 8705G has a die size of 125 mm², while the 5775R is notably larger at 182 mm². This is partly due to the integrated graphics: the 8705G uses Intel HD Graphics 630, while the 5775R uses Iris Pro Graphics 6200, a more robust iGPU for its time.

The PCIe layout is a major distinction. The 5775R offers 16 PCIe Gen 3 lanes from the CPU only, which is a full x16 connection for a discrete GPU. The 8705G, by contrast, provides only 8 PCIe Gen 3 lanes from the CPU. This makes the 5775R the more flexible choice for a dedicated graphics card setup, at least in terms of raw lane allocation. The 5775R also has a 6 MB shared L3 cache, whereas the 8705G has 8 MB shared L3 cache. Clock speeds differ too: the 8705G runs at a base clock of 3.10 GHz with a boost clock of 4.10 GHz, while the 5775R runs at a base clock of 3.30 GHz, boosting to 3.80 GHz.

Head-to-Head

Cinebench R15 multicore is a 8705G win at 651 points against 641 points for the 5775R, a 1.6% lead. R15 single-core has the 8705G at 91 points to 90, a smaller gap. R20 multicore again goes to 8705G at 2714 points against 2671 points for the 5775R, a 1.6% margin. R20 singlecore and R20 single-core at 383 points is a 8705G win versus 376 points for the 5775R, a 1.9% advantage. R23 multicore and R23 multicore scores are 6464 points for the 8705G and 6360 points for the 5775R, a 1.6% delta. R23 single-core is also at 912 points for the 8705G versus 897 points for the 5775R, a 1.7% lead.

Geekbench single-core is the 8705G's best result at 1277 points against 1218 points for the 5775R, a 4.8% advantage. Geekbench multicore is the 5775R's only win, scoring 3996 points against the 3968 points of the 8705G, a 0.7% win.

FAQ

Q: Which CPU should I choose for rendering workloads?

A: The data favors the 8705G. It wins every Cinebench test, with leads from 1.1% single-core to 1.9% in R20 single-core, and 1.6% multicore.

Q: Is the 5775R a viable alternative for a desktop PC?

A: The 5775R is a desktop part with 16 PCIe Gen 3 lanes and a 65 W TDP. The 8705G is a mobile part with 8 lanes.

Q: Does the 5775R outperform the 8705G in any benchmark?

**A: Yes, the 5775R wins Geekbench multicore at 3996 points against 3968 points for the 8705G, a 0.7% advantage.

Q: What is the difference in cache size?

A: The 8705G has 8 MB shared L3 cache, the 5775R has 6 MB shared L3 cache and the 5775R has 6 MB shared L3 cache.

Q: Which CPU has a higher boost clock speed in single-core performance?

**A: The 8705G has a higher Geekbench single-core score of 1277 points against 1218 points for the 5775R, a 4.8% lead.

Q: Are both processors 4-core, 8-thread parts?

**A: Yes, both the 8705G and the 5775R have 4 cores, 8 threads, with a 65 W TDP and a 14 nm process.

The Verdict data indicates a clear split.

Pick the 8705G if you prioritize raw benchmark results. It wins 7 of 8 tests, including all Cinebench R15, R20, R23, and both single-core tests. Its 4.8% Geekbench single-core win at 1277 points against 1218 points is the largest margin between them, and its 1.6% lead in multicore Cinebench and R23 multicore at 6464 points against 6360 points cements its position.

Choose the 5775R if you need a desktop-oriented part with more PCIe lanes and a specific Geekbench multicore win. The 5775R is a desktop part with 16 PCIe Gen 3 lanes and a 6 MB L3 cache. It also offers a Geekbench multicore win at 3996 points against 3968 points for the 5775R. The 5775R also offers a Geekbench multicore win at 3996 points. The 5775R offers a Geekbench multicore win for the 8705G.

The 5775R also offers a Geekbench multicore win at 3996 points against 3968 points for the 8705G, a 0.7% lead. The rest of the data shows the 8705G leads in all other R15 multicore, R20 multicore, R23 multicore, and R20 single-core. In short, the 8705G is the superior CPU in almost every metric, but the 5775R still has a niche with its 16-lane PCIe and the Geekbench multicore result, though it trails in Cinebench.

Specification Differences

The two CPUs differ in the following fields: socket (Intel BGA 2270 for the 8705G, Intel BGA 1364 for the 5775R), architecture (Kaby Lake vs Broadwell), codename (Kaby Lake G vs Broadwell), generation (Core i7 (Kaby Lake-G) vs Core i7 (Broadwell)), die size (125 mm² vs 182 mm²), L3 cache (8 MB shared vs 6 MB shared), memory support (DDR4 vs DDR3), memory bandwidth (38.4 GB/s vs 29.9 GB/s), PCIe lanes (Gen 3, 8 lanes CPU only vs Gen 3, 16 lanes CPU only), integrated graphics (Intel HD Graphics 630 vs Iris Pro Graphics 6200), base clock (3.10 GHz base clock vs 3.30 GHz base clock), boost clock (4.10 GHz boost clock vs 3.80 GHz boost clock), and market segment (Mobile vs Desktop). The 5775R has a launch MSRP of $384.