Intel Core i7-5775C: Broadwell for Desktops

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Intel Core i7-5775C: Broadwell for Desktops

September 20, 2015 by Lawrence Lee

Product
Intel Core i7-5775C
LGA1150 Processor
Manufacturer
Street Price
US$390

The big story in computer hardware this summer was the release of Intel's Skylake CPU microarchitecture, a long awaited platform update with a new socket and fresh chips for desktop systems. It's a notable one if only for the fact that their last upgrade cycle, that saw a die shrink from 22 nm to 14 nm, initially skipped over desktop users completely. The plan for Broadwell was to focus on low power SKUs for the mobile/embedded market. Intel eventually announced a couple of 65W LGA1150 variants, seemingly as an afterthought. Unfortunately delays meant the Core i7-5775C and Core i5-5675C were not released until the Skylake launch was imminent.


Our Core i7-5775C sample.

CPU-Z screenshot.

Broadwell "C" vs. Haswell/Skylake "K" Processors
Model
i5-5675C
i5-4690K
i5-6600K
i7-5775C
i7-4770K
i7-4790K
i7-6700K
Socket
LGA1150
LGA1150
LGA1151
LGA1150
LGA1150
LGA1150
LGA1151
Memory Support
DDR3
DDR3
DDR3L
DDR4
DDR3
DDR3
DDR3
DDR3L
DDR4
Cores / Threads
4 / 4
4 / 4
4 / 4
4 / 8
4 / 8
4 / 8
4 / 8
CPU Clock (Base/Turbo)
3.1 / 3.6 GHz
3.5 / 3.9 GHz
3.5 / 3.9 GHz
3.3 / 3.7 GHz
3.5 / 3.9 GHz
4.0 / 4.4 GHz
4.0 / 4.2 GHz
L3 Cache
4MB
6MB
6MB
6MB
8MB
8MB
8MB
eDRAM/L4 Cache
128MB
-
-
128MB
-
-
-
Graphics
Iris Pro 6200
HD 4600
HD 530
Iris Pro 6200
HD 4600
HD 4600
HD 530
Execution Units
48
20
24
48
20
20
24
Max GPU Clock
1100 MHz
1200 MHz
1150 MHz
1150 MHz
1250 MHz
1250 MHz
1150 MHz
TDP
65W
88W
91W
65W
84W
88W
91W
Street Price (USD)
$280*
$230
$240
$390*
$330
$300
$355
* pre-order/out of stock pricing

Though obviously overshadowed by Skylake, these processors are more interesting for reasons beyond Intel's poor timing. Broadwell was never intended for the desktop so they exhibit qualities of mobile chips. To hit the lower power envelope, clock speeds are lower than their Haswell counterparts, but bizarrely, they have unlocked CPU multipliers which makes them overclocking friendly. This defeats the purpose of having a 65W TDP as this limit undoubtedly needs to overruled to hit higher clock speeds.

There's also a 2MB L3 cache penalty but hopefully this can be compensated for with 128MB of eDRAM that acts as L4 cache. This extra onboard memory can be accessed directly both by the CPU portion and by the pimped out integrated graphics. The two chips are armed with Iris Pro 6200 graphics which sport twice as many execution units (Intel's equivalent of GPU cores) compared to the HD 530 graphics of the Skylake "K" models.

Suggested pricing is US$230 and US$350 for the i5-5675C and i7-5775C respectively, but with low initial stock and surprisingly high demand, it's impossible to find any available for immediate purchase, resulting in prices being inflated by US$40~$50 at the minimum. And while they offer backwards compatibility with LGA1150 boards, it's limited to 9-series chipset models, assuming the manufacturer offers the necessary BIOS update.



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