Intel Core i5-1145GRE vs Intel Core i7-5775R Comparison

Intel Core i7-5775R and Intel Core i5-1145GRE are both 4-core, 8-thread Intel parts, yet they belong to different eras and design philosophies. The benchmark data shows the i5-1145GRE winning all six head-to-head Cinebench tests, with a consistent performance advantage of roughly 9.1% to 9.2% across single-core and multi-core workloads. Despite the i7-5775R’s higher base clock (3.30 GHz vs 1500.00 MHz), the i5-1145GRE’s superior boost clock (4.10 GHz vs 3.80 GHz), newer 10 nm process, and larger cache configuration allow it to pull ahead in every measured scenario. The i7-5775R, however, holds its own in average benchmark score (2031 vs 2025) and lands in the same 45th percentile of all CPUs, making this a closer contest than the head-to-head sweep suggests.

FAQ

Q: Which processor wins in Cinebench multi-core tests?

A: The Intel Core i5-1145GRE wins all three multi-core Cinebench tests. In Cinebench R15 multi-core, it scores 705 against the i7-5775R’s 641 (a 9.1% lead). In Cinebench R20 multi-core, it scores 2940 versus 2671 (9.1% lead). In Cinebench R23 multi-core, it scores 7001 against 6360 (9.2% lead).

Q: Is the single-core performance gap the same as multi-core?

A: Yes, the single-core deltas are nearly identical. The i5-1145GRE leads by 9.1% in Cinebench R15 single-core (99 vs 90), 9.2% in Cinebench R20 single-core (414 vs 376), and 9.2% in Cinebench R23 single-core (988 vs 897).

Q: How do their average benchmark scores compare?

A: The i7-5775R has a slightly higher average benchmark score of 2031, while the i5-1145GRE averages 2025. This places the i7-5775R just 0.3% ahead of the i5-1145GRE in overall aggregate performance, despite losing every head-to-head Cinebench test.

Q: What are the architectural process nodes for each?

A: The i7-5775R is built on Intel’s 14 nm Broadwell architecture, while the i5-1145GRE uses the 10 nm Tiger Lake (Willow Cove-U) architecture. The die sizes differ accordingly: 182 mm² for the i7-5775R and 144 mm² for the i5-1145GRE.

Q: Do both CPUs support ECC memory?

A: No. The i5-1145GRE supports ECC memory, while the i7-5775R does not. This is a notable distinction for workstation or reliability-focused builds.

Q: What is the production status of each processor?

A: The i7-5775R is marked as end-of-life, whereas the i5-1145GRE is listed as active. Their release dates are 2015-05-14 for the i7-5775R and 2020-09-01 for the i5-1145GRE.

Where Each One Wins

The i5-1145GRE is the outright winner in every benchmark category recorded in the head-to-head data. It dominates across all six Cinebench tests, covering both single-core and multi-core workloads. This makes it the clear choice for any application that relies on Cinebench-style rendering or CPU-bound tasks that benefit from higher boost clocks and a more modern architecture. The i5-1145GRE’s 4.10 GHz boost clock, compared to the i7-5775R’s 3.80 GHz, gives it a consistent edge in bursty, short-duration workloads where turbo frequencies matter most.

The i7-5775R, while losing every head-to-head test, does not lose the aggregate battle. Its average benchmark score of 2031 edges out the i5-1145GRE’s 2025, and it matches the i5-1145GRE’s 45th percentile ranking. This suggests the i7-5775R may perform better in non-Cinebench workloads that are included in the average score calculation, potentially due to its higher base clock (3.30 GHz vs 1500.00 MHz) which sustains performance in prolonged, non-turbo scenarios. The i7-5775R also offers more PCIe lanes (16 vs 4) and a larger memory bandwidth figure (29.9 GB/s vs null), which could benefit certain memory-intensive or I/O-heavy tasks.

Architecture Differences

The architectural gap between these two CPUs is substantial. The i7-5775R uses Intel’s 14 nm Broadwell architecture, a desktop-oriented design that was modern in 2015. Its die size is 182 mm², and it features 64 KB of L1 cache per core and 256 KB of L2 cache per core, with a shared 6 MB L3 cache. The integrated graphics are Iris Pro Graphics 6200, a notable GPU for its time.

The i5-1145GRE, by contrast, is built on Tiger Lake (Willow Cove-U) using a 10 nm process, which is a significant node shrink. Its die is smaller at 144 mm², yet it packs more cache: 80 KB of L1 per core, 1.25 MB of L2 per core, and a shared 8 MB L3. The integrated graphics are Iris Xe Graphics G7 80EU, a much newer GPU architecture. The i5-1145GRE also supports DDR4 and LPDDR4X memory, while the i7-5775R is limited to DDR3. This generational leap in architecture explains why the i5-1145GRE achieves higher scores despite a much lower base clock.

Specification Differences

The two processors differ in nearly every major specification field. The base clock is a stark contrast: the i7-5775R runs at 3.30 GHz, while the i5-1145GRE sits at 1500.00 MHz, though the latter boosts to a higher 4.10 GHz versus the former’s 3.80 GHz. TDP is another major difference: the i7-5775R draws 65 W, while the i5-1145GRE is rated at 28 W, reflecting its mobile design. Sockets are incompatible: Intel BGA 1364 for the i7-5775R versus Intel BGA 1449 for the i5-1145GRE.

Memory support diverges completely, with the i7-5775R using dual-channel DDR3 and the i5-1145GRE using dual-channel DDR4 or LPDDR4X. The i7-5775R has a listed memory bandwidth of 29.9 GB/s, while the i5-1145GRE’s bandwidth is not specified. PCIe capability also differs: the i7-5775R supports Gen 3 with 16 lanes, while the i5-1145GRE supports Gen 4 but only 4 lanes. ECC memory is supported only on the i5-1145GRE. The market segments are distinct: Desktop for the i7-5775R, Mobile for the i5-1145GRE. Production status, release date, and launch MSRP ($384 vs $362) further separate them.

Head-to-Head Benchmarks

The i5-1145GRE wins all six head-to-head Cinebench tests, and the margins are remarkably consistent. In Cinebench R15 multi-core, the i5-1145GRE scores 705 against the i7-5775R’s 641, a 9.1% advantage. Single-core in R15 shows the same delta: 99 versus 90, again 9.1%. Moving to Cinebench R20, the multi-core test has the i5-1145GRE at 2940 versus 2671, a 9.1% lead, while single-core is 414 versus 376, a 9.2% lead. The pattern holds in Cinebench R23: multi-core sees the i5-1145GRE at 7001 versus 6360 (9.2%), and single-core at 988 versus 897 (9.2%).

The consistency of the delta—hovering between 9.1% and 9.2%—indicates that the performance gap is largely architectural rather than workload-specific. The i5-1145GRE’s higher boost clock (4.10 GHz vs 3.80 GHz) and larger L2 cache (1.25 MB vs 256 KB per core) likely drive this uniform advantage. The i7-5775R’s higher base clock does not compensate, as Cinebench tends to leverage boost frequencies under load. Notably, the i7-5775R has a Geekbench multi-core score of 3996 and single-core of 1218, but the i5-1145GRE lacks Geekbench data in the pack, so no direct comparison is possible there.

The Verdict

The data is unambiguous: the Intel Core i5-1145GRE is the faster processor in every measured Cinebench workload, winning all six head-to-head tests with a 9.1% to 9.2% margin. For anyone prioritizing raw CPU performance in rendering or similar multi-threaded tasks, the i5-1145GRE is the superior choice. Its lower TDP (28 W vs 65 W), active production status, and ECC memory support further strengthen its case for modern mobile or embedded systems.

The i7-5775R, however, should not be dismissed. Its average benchmark score of 2031 is slightly higher than the i5-1145GRE’s 2025, and both CPUs sit at the 45th percentile of all processors. This suggests that outside of Cinebench, the i7-5775R may compete favorably, likely due to its higher base clock sustaining performance in workloads that do not trigger maximum turbo. The i7-5775R also offers 16 PCIe Gen 3 lanes versus the i5-1145GRE’s 4 Gen 4 lanes, which could be decisive for systems requiring extensive I/O expansion. Its 29.9 GB/s memory bandwidth is a specified advantage over the i5-1145GRE’s unspecified figure.

Choosing between them depends on the workload. The i5-1145GRE is the benchmark champion, winning every head-to-head test and delivering newer architecture, better power efficiency, and ECC support. The i7-5775R is the aggregate-score leader with more PCIe lanes and a higher base clock, making it viable for desktop builds where sustained multi-core performance and I/O flexibility matter more than peak Cinebench numbers. The benchmark results favor the i5-1145GRE, but the i7-5775R’s overall average keeps this contest closer than a 6-0 sweep suggests.