Notebookcheck Logo

15 W Core i5-1235U vs. 28 W Core i5-1135G7: Newer isn't always better

15 W Core i5-1235U vs. 28 W Core i5-1135G7: Newer isn't always better (Image source: Intel)
15 W Core i5-1235U vs. 28 W Core i5-1135G7: Newer isn't always better (Image source: Intel)
The Core i5-1235U offers similar CPU performance as the Core i5-1135G7 while consuming less power, but graphics performance has taken a hit.

With Intel 12th gen laptops widely available, we now have a a handful of Alder Lake models in our database sporting everything from the Core i7-1255U to the Core i7-1260P to the Core i9-12900HX. The mobile 12th gen family thus far has been pretty good for the most part when it comes to performance even if performance-per-watt isn't always the best. Nonetheless, there is at least one particular SKU that we recommend users to think twice about.

After reviewing two separate models with the same Core i5-1235U option, we can comfortably say that this 12th gen CPU offers very little over the average i5-1135G7 in terms of overall performance. Single-thread performance may be a bit higher, but it's nothing to write home about. Laptops sporting the 11th gen Core i5-1135U are often less expensive as well which makes the Core i5-1235U that much less lucrative for buyers.

Moving one step up from the Core i5-1235U to the Core i7-1255U is actually quite significant as the latter can provide up to 60 percent faster multi-thread performance. The i5-1235U is a performance outlier in this regard and it can sometimes feel like a rebranded Core i5-1135G7 as a result.

Graphics performance from the integrated Iris Xe 80 EUs is actually weaker on the Core i5-1235U as well at roughly 10 to 15 percent slower than the average laptop in our database equipped with the same integrated GPU.

However, one aspect that the Core i5-1235U seems to have the upper hand on is power consumption. Our graph below compares the Core i5-1235U Vaio FE14 to the Core i5-1135G7 LG Gram 14 when running Prime95 on an external monitor. The LG system would consume about 39 percent more power despite both models showing roughly equal multi-thread performance. This aligns with the fact that the i5-1235U was designed under a 15 W TDP envelope compared to the 28 W i5-1135G7.

If you can't decide between a Core i5-1235U or Core i5-1135G7 laptop, then just keep in mind that the newer option offers roughly the same CPU performance and is more power efficient but at the cost of slower graphics performance. Upgrading to the Core i7-1255U instead can be a decent option if you want to stick to the 12th gen Core U-series.

Cinebench R15 Multi Loop

04080120160200240280320360400440480520560600640680720760Tooltip
VAIO FE 14.1 VWNC51429-SL Intel Core i5-1235U: Ø672 (654.55-785.22)
LG Gram 14T90P Intel Core i5-1135G7: Ø686 (665.48-795.81)
Cinebench R20: CPU (Multi Core) | CPU (Single Core)
Cinebench R23: Multi Core | Single Core
Cinebench R15: CPU Multi 64Bit | CPU Single 64Bit
Blender: v2.79 BMW27 CPU
7-Zip 18.03: 7z b 4 | 7z b 4 -mmt1
Geekbench 5.4: Multi-Core | Single-Core
HWBOT x265 Benchmark v2.2: 4k Preset
LibreOffice : 20 Documents To PDF
R Benchmark 2.5: Overall mean
Cinebench R20 / CPU (Multi Core)
LG Gram 14T90P
Intel Core i5-1135G7
1870 Points ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
1783 Points ∼95%
Cinebench R20 / CPU (Single Core)
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
568 Points ∼100%
LG Gram 14T90P
Intel Core i5-1135G7
518 Points ∼91%
Cinebench R23 / Multi Core
LG Gram 14T90P
Intel Core i5-1135G7
4874 (4269.81min - 4874.32max) Points ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
4651 (4181.43min - 4650.61max) Points ∼95%
Cinebench R23 / Single Core
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
1474 Points ∼100%
LG Gram 14T90P
Intel Core i5-1135G7
1346 Points ∼91%
Cinebench R15 / CPU Multi 64Bit
LG Gram 14T90P
Intel Core i5-1135G7
796 (665.48min - 795.81max) Points ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
785 (654.55min - 785.22max) Points ∼99%
Cinebench R15 / CPU Single 64Bit
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
212 Points ∼100%
LG Gram 14T90P
Intel Core i5-1135G7
141.4 Points ∼67%
Blender / v2.79 BMW27 CPU
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
662 Seconds * ∼100%
LG Gram 14T90P
Intel Core i5-1135G7
651 Seconds * ∼98%
7-Zip 18.03 / 7z b 4
LG Gram 14T90P
Intel Core i5-1135G7
21885 MIPS ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
20166 MIPS ∼92%
7-Zip 18.03 / 7z b 4 -mmt1
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
4778 MIPS ∼100%
LG Gram 14T90P
Intel Core i5-1135G7
4704 MIPS ∼98%
Geekbench 5.4 / Multi-Core
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
5614 Points ∼100%
LG Gram 14T90P
Intel Core i5-1135G7
5150 Points ∼92%
Geekbench 5.4 / Single-Core
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
1641 Points ∼100%
LG Gram 14T90P
Intel Core i5-1135G7
1399 Points ∼85%
HWBOT x265 Benchmark v2.2 / 4k Preset
LG Gram 14T90P
Intel Core i5-1135G7
6.11 fps ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
4.99 fps ∼82%
LibreOffice / 20 Documents To PDF
LG Gram 14T90P
Intel Core i5-1135G7
55.2 s * ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
51.4 s * ∼93%
R Benchmark 2.5 / Overall mean
LG Gram 14T90P
Intel Core i5-1135G7
0.638 sec * ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
0.531 sec * ∼83%

* ... smaller is better

3DMark
1920x1080 Fire Strike Graphics
LG Gram 14T90P
Intel Iris Xe Graphics G7 80EUs, Intel Core i5-1135G7
4837 Points ∼100%
Average Intel Iris Xe Graphics G7 80EUs
  (1560 - 4847, n=70)
3601 Points ∼74%
VAIO FE 14.1 VWNC51429-SL
Intel Iris Xe Graphics G7 80EUs, Intel Core i5-1235U
3251 Points ∼67%
2560x1440 Time Spy Graphics
LG Gram 14T90P
Intel Iris Xe Graphics G7 80EUs, Intel Core i5-1135G7
1178 Points ∼100%
Average Intel Iris Xe Graphics G7 80EUs
  (743 - 1511, n=67)
1132 Points ∼96%
VAIO FE 14.1 VWNC51429-SL
Intel Iris Xe Graphics G7 80EUs, Intel Core i5-1235U
985 Points ∼84%
2560x1440 Time Spy Score
LG Gram 14T90P
Intel Iris Xe Graphics G7 80EUs, Intel Core i5-1135G7
1295 Points ∼100%
Average Intel Iris Xe Graphics G7 80EUs
  (833 - 1689, n=67)
1268 Points ∼98%
VAIO FE 14.1 VWNC51429-SL
Intel Iris Xe Graphics G7 80EUs, Intel Core i5-1235U
1097 Points ∼85%
3DMark 11 - 1280x720 Performance GPU
LG Gram 14T90P
Intel Iris Xe Graphics G7 80EUs, Intel Core i5-1135G7
6085 Points ∼100%
Average Intel Iris Xe Graphics G7 80EUs
  (2246 - 6120, n=68)
5087 Points ∼84%
VAIO FE 14.1 VWNC51429-SL
Intel Iris Xe Graphics G7 80EUs, Intel Core i5-1235U
4511 Points ∼74%

Power Consumption external Monitor

05101520253035404550556065Tooltip
VAIO FE 14.1 VWNC51429-SL i5-1235U, Iris Xe G7 80EUs; Prime95 V28,10 Stress (external Monitor): Ø27.8 (25.6-55.8)
LG Gram 14T90P i5-1135G7, Iris Xe G7 80EUs; Prime95 V28,10 Stress (external Monitor): Ø41.3 (37.3-65.6)
VAIO FE 14.1 VWNC51429-SL i5-1235U, Iris Xe G7 80EUs; Cinebench R15 Multi (external Monitor): Ø28.9 (23.6-54.8)
LG Gram 14T90P i5-1135G7, Iris Xe G7 80EUs; Cinebench R15 Multi (external Monitor): Ø41.4 (22.3-46.5)
VAIO FE 14.1 VWNC51429-SL i5-1235U, Iris Xe G7 80EUs; 1280x720 FurMark 1.19 GPU Stress Test (external Monitor): Ø26.1 (21.8-31.3)
LG Gram 14T90P i5-1135G7, Iris Xe G7 80EUs; 1280x720 FurMark 1.19 GPU Stress Test (external Monitor): Ø32.9 (28.4-42.9)
VAIO FE 14.1 VWNC51429-SL i5-1235U, Iris Xe G7 80EUs; 1920x1080 The Witcher 3 ultra (external Monitor): Ø26.8 (23.1-28.8)
LG Gram 14T90P i5-1135G7, Iris Xe G7 80EUs; 1920x1080 The Witcher 3 ultra (external Monitor): Ø32.5 (29.3-37.5)
Read all 9 comments / answer
static version load dynamic
Loading Comments
Comment on this article
Please share our article, every link counts!
.170
> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2022 07 > 15 W Core i5-1235U vs. 28 W Core i5-1135G7: Newer isn't always better
Allen Ngo, 2022-07-29 (Update: 2022-07-29)