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The Core i5-1235U had a terrible launch until the Lenovo IdeaPad Flex i5 14 saved it

The Core i5-1235U was terrible until the Lenovo IdeaPad Flex i5 14 saved it
The Core i5-1235U was terrible until the Lenovo IdeaPad Flex i5 14 saved it
To our surprise, the budget Lenovo convertible is the best model to get thus far if you want to see the Core i5-1235U at its best. The performance delta between a 15 W and 25 W TDP CPU is significant and worthy of attention for users in the market for a new 12th gen Intel laptop.

When the 12th gen Core i5-1235U CPU launched earlier this year, the Gateway Ultra Slim 14 was our first review model to sport the Alder Lake processor. We weren't sure what to expect when it came to performance, but results were disappointing to say the least. Nonetheless, we reserved judgment on the processor as no one laptop is ever representative of any CPU.

The second Core i5-1235U laptop to come in a few weeks later was the Vaio FE14 and, unfortunately, results were similar to what we observed on the Gateway. Overall performance was not any better than the older and cheaper Core i5-1135G7 that the Core i5-1235U was supposed to replace. Our hopes weren't very high for the 12th gen Core i5 processor at this point.

Luckily for users still interested in the Core i5-1235U, our third laptop to come in with the CPU managed to perform significantly faster than expected blowing both the Vaio and Gateway out of the water. As shown by our results below, the Lenovo IdeaPad Flex 5i 14 is 40 to 75 percent faster in multi-threaded applications than either of the two other laptop options. The improvement is so large that the Lenovo is able to outperform most Core i7-1165G7 laptops while being just a few percentage point shy from the Core i7-1255U.

Looking more closely at the Vaio, Gateway, and Lenovo laptops shows why the Lenovo model is so much faster even though they all carry the same Core i5-1235U processor. The CPUs in the Gateway and Vaio stabilize at only 15 W when under stressful loads while the the CPU in the Lenovo would stabilize at 26 W. The Lenovo model draws more power in order to provide faster clock rates and performance.

The performance discrepancies between these laptops present a problem to consumers because it is nearly impossible to know what TDP ranges some laptop models are targeting without deeper research. A user who purchased the Vaio FE14 or Gateway Ultra Slim 14 for their 12th gen Core i5 CPUs, for example, may find themselves disappointed as neither manufacturer makes it overtly clear about how their CPUs will perform. We can at least safely say that the Lenovo IdeaPad Flex 5i 14 is your best bet thus far when it comes to the Core i5-1235U.

Cinebench R15 Multi Loop

0651301952603253904555205856507157808459109751040110511701235Tooltip
Lenovo IdeaPad Flex 5i 14IAU7 Intel Core i5-1235U: Ø1010 (968.85-1267.51)
VAIO FE 14.1 VWNC51429-SL Intel Core i5-1235U: Ø672 (654.55-785.22)
Gateway Ultra Slim 14.1 GWTC51427 Intel Core i5-1235U: Ø778 (754.47-811.64)
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)
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
2797 Points ∼100%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
1949 Points ∼70% -30%
Average Intel Core i5-1135G7
  (979 - 2382, n=58)
1819 Points ∼65% -35%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
1783 Points ∼64% -36%
Cinebench R20 / CPU (Single Core)
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
643 Points ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
568 Points ∼88% -12%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
566 Points ∼88% -12%
Average Intel Core i5-1135G7
  (375 - 527, n=58)
507 Points ∼79% -21%
Cinebench R23 / Multi Core
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
8117 (6244.61min - 8116.52max) Points ∼100%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
5085 (4711.28min - 5085.37max) Points ∼63% -37%
Average Intel Core i5-1135G7
  (2786 - 6136, n=51)
4706 Points ∼58% -42%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
4651 (4181.43min - 4650.61max) Points ∼57% -43%
Cinebench R23 / Single Core
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
1671 Points ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
1474 Points ∼88% -12%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
1444 Points ∼86% -14%
Average Intel Core i5-1135G7
  (1062 - 1373, n=49)
1321 Points ∼79% -21%
Cinebench R15 / CPU Multi 64Bit
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
1268 (968.85min - 1267.51max) Points ∼100%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
812 (754.47min - 811.64max) Points ∼64% -36%
Average Intel Core i5-1135G7
  (431 - 941, n=61)
790 Points ∼62% -38%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
785 (654.55min - 785.22max) Points ∼62% -38%
Cinebench R15 / CPU Single 64Bit
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
238 Points ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
212 Points ∼89% -11%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
195.8 Points ∼82% -18%
Average Intel Core i5-1135G7
  (141.4 - 205, n=57)
194.3 Points ∼82% -18%
Blender / v2.79 BMW27 CPU
Average Intel Core i5-1135G7
  (499 - 1044, n=56)
663 Seconds * ∼100% -66%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
662 Seconds * ∼100% -66%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
583 Seconds * ∼88% -46%
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
399 Seconds * ∼60%
7-Zip 18.03 / 7z b 4
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
31892 MIPS ∼100%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
24325 MIPS ∼76% -24%
Average Intel Core i5-1135G7
  (14745 - 24873, n=58)
21371 MIPS ∼67% -33%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
20166 MIPS ∼63% -37%
7-Zip 18.03 / 7z b 4 -mmt1
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
5083 MIPS ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
4778 MIPS ∼94% -6%
Average Intel Core i5-1135G7
  (3924 - 4921, n=58)
4677 MIPS ∼92% -8%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
4371 MIPS ∼86% -14%
Geekbench 5.4 / Multi-Core
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
8422 Points ∼100%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
5691 Points ∼68% -32%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
5614 Points ∼67% -33%
Average Intel Core i5-1135G7
  (3475 - 5472, n=54)
4666 Points ∼55% -45%
Geekbench 5.4 / Single-Core
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
1641 Points ∼100% 0%
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
1636 Points ∼100%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
1456 Points ∼89% -11%
Average Intel Core i5-1135G7
  (1147 - 1428, n=54)
1374 Points ∼84% -16%
HWBOT x265 Benchmark v2.2 / 4k Preset
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
9.39 fps ∼100%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
6.14 fps ∼65% -35%
Average Intel Core i5-1135G7
  (3.57 - 7.6, n=53)
5.91 fps ∼63% -37%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
4.99 fps ∼53% -47%
LibreOffice / 20 Documents To PDF
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
65.5 s * ∼100% -29%
Average Intel Core i5-1135G7
  (44.2 - 62.9, n=56)
52.8 s * ∼81% -4%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
51.4 s * ∼78% -2%
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
50.6 s * ∼77%
R Benchmark 2.5 / Overall mean
Average Intel Core i5-1135G7
  (0.619 - 0.727, n=55)
0.642 sec * ∼100% -29%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U
0.603 sec * ∼94% -21%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U
0.531 sec * ∼83% -6%
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U
0.4986 sec * ∼78%

* ... smaller is better

Performance Rating
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
96 pt ∼96%
Average Intel Core i5-1135G7
 
84.5 pt ∼85%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
60.9 pt ∼61%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
55.5 pt ∼56%
AIDA64 / FP32 Ray-Trace
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
6606 KRay/s ∼100%
Average Intel Core i5-1135G7
  (4313 - 7952, n=41)
6436 KRay/s ∼97% -3%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
3804 KRay/s ∼58% -42%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
3078 KRay/s ∼47% -53%
AIDA64 / FPU Julia
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
33940 Points ∼100%
Average Intel Core i5-1135G7
  (19402 - 32283, n=41)
26915 Points ∼79% -21%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
20278 Points ∼60% -40%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
15838 Points ∼47% -53%
AIDA64 / CPU SHA3
Average Intel Core i5-1135G7
  (1316 - 2172, n=41)
1829 MB/s ∼100% +1%
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
1803 MB/s ∼99%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
1099 MB/s ∼60% -39%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
978 MB/s ∼53% -46%
AIDA64 / CPU Queen
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
62404 Points ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
57029 Points ∼91% -9%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
54118 Points ∼87% -13%
Average Intel Core i5-1135G7
  (39000 - 46951, n=41)
45681 Points ∼73% -27%
AIDA64 / FPU SinJulia
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
4501 Points ∼100%
Average Intel Core i5-1135G7
  (3497 - 4445, n=41)
4213 Points ∼94% -6%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
3591 Points ∼80% -20%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
3099 Points ∼69% -31%
AIDA64 / FPU Mandel
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
16909 Points ∼100%
Average Intel Core i5-1135G7
  (12569 - 19635, n=41)
16280 Points ∼96% -4%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
9602 Points ∼57% -43%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
8046 Points ∼48% -52%
AIDA64 / CPU AES
Average Intel Core i5-1135G7
  (28988 - 67969, n=41)
58430 MB/s ∼100% +62%
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
36016 MB/s ∼62%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
23702 MB/s ∼41% -34%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
23386 MB/s ∼40% -35%
AIDA64 / CPU ZLib
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
531 MB/s ∼100%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
368 MB/s ∼69% -31%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
329 MB/s ∼62% -38%
Average Intel Core i5-1135G7
  (265 - 373, n=47)
285 MB/s ∼54% -46%
AIDA64 / FP64 Ray-Trace
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
3548 KRay/s ∼100%
Average Intel Core i5-1135G7
  (2226 - 4291, n=41)
3422 KRay/s ∼96% -4%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
1996 KRay/s ∼56% -44%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
1670 KRay/s ∼47% -53%
AIDA64 / CPU PhotoWorxx
Lenovo IdeaPad Flex 5i 14IAU7
Intel Core i5-1235U, Iris Xe G7 80EUs
41909 MPixel/s ∼100%
VAIO FE 14.1 VWNC51429-SL
Intel Core i5-1235U, Iris Xe G7 80EUs
23434 MPixel/s ∼56% -44%
Average Intel Core i5-1135G7
  (9004 - 45366, n=41)
22998 MPixel/s ∼55% -45%
Gateway Ultra Slim 14.1 GWTC51427
Intel Core i5-1235U, Iris Xe G7 80EUs
15933 MPixel/s ∼38% -62%

Power Consumption external Monitor

05101520253035404550556065Tooltip
Lenovo IdeaPad Flex 5i 14IAU7 i5-1235U, Iris Xe G7 80EUs; Prime95 V28,10 Stress (external Monitor): Ø41.4 (36.9-68.9)
VAIO FE 14.1 VWNC51429-SL i5-1235U, Iris Xe G7 80EUs; Prime95 V28,10 Stress (external Monitor): Ø27.8 (25.6-55.8)
Gateway Ultra Slim 14.1 GWTC51427 i5-1235U, Iris Xe G7 80EUs; Prime95 V28,10 Stress (external Monitor): Ø28.2 (25.9-40.7)
Lenovo IdeaPad Flex 5i 14IAU7 i5-1235U, Iris Xe G7 80EUs; Cinebench R15 Multi (external Monitor): Ø51.8 (37-68.9)
VAIO FE 14.1 VWNC51429-SL i5-1235U, Iris Xe G7 80EUs; Cinebench R15 Multi (external Monitor): Ø28.9 (23.6-54.8)
Gateway Ultra Slim 14.1 GWTC51427 i5-1235U, Iris Xe G7 80EUs; Cinebench R15 Multi (external Monitor): Ø31.8 (24.1-41.5)

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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2022 08 > The Core i5-1235U had a terrible launch until the Lenovo IdeaPad Flex i5 14 saved it
Allen Ngo, 2022-08-27 (Update: 2022-08-28)