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ROG Zephyrus S Ultra Slim Gaming PC Laptop (GX531G)

by ASUS

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Asus ROG Zephyrus S Gaming PC Laptop (GX531G) Supports USB 3.1 Gen 2 Speeds But No Thunderbolt

The ROG Zephyrus S Gaming PC Laptop (GX531G) is part of Asus's Republic of Gamers (ROG) series of gaming PC's which is also one of the few USB 3.1 Gen 2 hosts available in the market based on Intel chipset but not on the Intel Thunderbolt solution. The PC comes with a 3.9 GHz 8th Gen Intel Core i7 processor, NVIDIA GeForce GTX 1070 graphics with 8 GB video memory, 16 GB DDR4 RAM, 2.766 MHz memory speed and 512 GB Hybrid SSD with 10000 RPM rotational speed.

With 15.6 in screen and 1920x1080 resolutions, the Asus ROG Zephyrus S Gaming PC Laptop (GX531G) also carries USB ports supporting USB 3.1 Gen 2 (10 Gb/s) and USB 3.1 Gen 1 (5 Gb/s) speeds over Type-C and a HDMI 2.0 port along with Windows 10, 802.11ac Wi-Fi and Bluetooth 4.0. The Asus PC can use USB Power Delivery technology for charging as well.

Here's how the Asus ROG Zephyrus S Gaming PC Laptop (GX531G) looks like after purchase.

The Asus ROG Zephyrus S Gaming PC Laptop (GX531G) ships with only a 19.5V @ 9.23A (180 watts) AC power adapter and some documentation, just like many of the ROG models such as the Asus ROG Strix GL502VM.

On one side of the PC you can find one audio in/out port, two USB Type-A ports, one USB Type-C port and the AC power input.

The other side has one HDMI 2.0 output port, Kensington lock, one USB Type-C port and one USB Type-A port.

As with most gaming PC's, the Asus PC also comes with a LED backlight keyboard.

Using the USB Power Test App from Granite River Labs with the Granite River Labs USB Power Delivery Compliance C2 Tester, we generate the following test results for the Asus ROG Zephyrus S Gaming PC Laptop (GX531G) to observe its power capabilities.

The USB Power Test App first negotiates a power contract emulating the Source to determine the Power Delivery Sink capabilities of the Asus PC. The USB Power Test App then reports out the voltage and current supported by the PC for each of the Source PDO's advertised to the PC. We can see that the PC gets 60W charging using the USB 3.1 Gen 2 / DisplayPort Alt Mode port; however this is lower than the 19.5V @ 9.23A (180 watts) provided by its supplied AC power adapter.

SinkCapVoltageCurrentPower
5V5.222.8814.51
6V6.092.8817.72
7V7.072.920.69
8V8.072.9223.4
9V9.072.926.35
10V10.12.929.39
11V11.092.932.27
12V12.072.9135.18
13V13.12.9238.07
14V14.082.9140.98
15V15.072.9243.97
16V16.112.9447.54
17V17.12.9249.96
18V18.072.9253.42
19V19.322.9256.1
20V20.092.9359.16

The USB Power Test App from Granite River Labs also produces a voltage, current trace plot which graphically shows the voltage and current requested by the Asus ROG Zephyrus S Gaming PC Laptop (GX531G) for each advertised Source PDO throughout the power negotiation.

Using the USB Power Delivery Compliance C2 Tester from Granite River Labs to run just a subset of the full USB Power Delivery compliance test suite, we can verify that the Asus ROG Zephyrus S Gaming PC Laptop (GX531G) supports a fixed Source PDO of .03 watts (.1 volts @ .3 amps) and several fixed Sink PDO's of .009 watts (.1 volts @ .09 amps), .02 watts (.18 volts @ .09 amps), .027 watts (.3 volts @ .09 amps), .036 watts (.4 volts @ .09 amps) , .027 watts (.3 volts @ .09 amps) as well as variable power supply of .009 to .036 watts range (.1-.4 volts @ .09 amps) for charging. Note some compliance failures were observed.

Source Capabilities

Parameter

GetCapabilities

Src_PDO_Supply_Type 

Fixed

Src_PDO_Peak_Current

0

Src_PDO_Voltage

100 (mV)

Src_PDO_Max_Current 

300 (mA)

Sink Capabilities

Parameter

GetCapabilities

Snk_PDO_Supply_Type #1

Fixed

Snk_PDO_Voltage #1

100 (mV)

Snk_PDO_Op_Current #1

90 (mA)

Snk_PDO_Supply_Type #2

Fixed

Snk_PDO_Voltage #2

180 (mV)

Snk_PDO_Op_Current #2

90 (mA)

Snk_PDO_Supply_Type #3

Fixed

Snk_PDO_Voltage #3

300 (mV)

Snk_PDO_Op_Current #3

90 (mA)

Snk_PDO_Supply_Type #4

Fixed

Snk_PDO_Voltage #4

400 (mV)

Snk_PDO_Op_Current #4

90 (mA)

Snk_PDO_Supply_Type #5

Variable

Snk_PDO_Max_Voltage #5

400 (mV)

Snk_PDO_Min_Voltage #5

100 (mV)

Snk_PDO_Op_Current #5

90 (mA)

Power Delivery 3.0 Tests - Test Result Summary

Sl No

Test ID

Test Name

Test Result

1

TD.PD.LL3.E1

TD.PD.LL3.E1 GoodCRC Specification Revision compatibility

PASS

2

TD.PD.LL3.E2

TD.PD.LL3.E2 Retransmission

PASS

3

TD.PD.LL3.E3

TD.PD.LL3.E3 GoodCRC Compatibility with PD2

PASS

4

TD.PD.SRC3.E1

TD.PD.SRC3.E1 Source Capability Fields Checks

PASS

5

TD.PD.SRC3.E2

TD.PD.SRC3.E2 Accept Fields Checks

PASS

6

TD.PD.SRC3.E3

TD.PD.SRC3.E3 PSRDY Fields Checks

PASS

7

TD.PD.SRC3.E4

TD.PD.SRC3.E4 Specification Revision Check after Contract

PASS

8

TD.PD.SRC3.E5

TD.PD.SRC3.E5 Source Capabilities Extended sent timely

PASS

9

TD.PD.SRC3.E6

TD.PD.SRC3.E6 Source Capabilities Extended Fields Checks

FAIL

10

TD.PD.SRC3.E7

TD.PD.SRC3.E7 Battery Status sent Timely

PASS

11

TD.PD.SRC3.E8

TD.PD.SRC3.E8 Battery Status Fields Checks

PASS

12

TD.PD.SRC3.E9

TD.PD.SRC3.E9 Battery Status Fields Checks Invalid Battery reference

PASS

13

TD.PD.SRC3.E10

TD.PD.SRC3.E10 Unrecognized Message Received in Ready State

PASS

14

TD.PD.SRC3.E11

TD.PD.SRC3.E11 Get Status Fields Checks

PASS

15

TD.PD.SRC3.E12

TD.PD.SRC3.E12 Get Battery Status Fields Checks

PASS

16

TD.PD.SRC3.E13

TD.PD.SRC3.E13 Status sent timely

PASS

17

TD.PD.SRC3.E14

TD.PD.SRC3.E14 Status Fields Checks

FAIL

18

TD.PD.SRC3.E15

TD.PD.SRC3.E15 Battery Capabilities sent timely

PASS

19

TD.PD.SRC3.E16

TD.PD.SRC3.E16 Battery Capabilities Fields Checks

PASS

20

TD.PD.SRC3.E17

TD.PD.SRC3.E17 Battery Capabilities Fields Checks Invalid Battery Reference

PASS

21

TD.PD.SRC3.E18

TD.PD.SRC3.E18 Manufacturer Info Sent Timely

PASS

22

TD.PD.SRC3.E19

TD.PD.SRC3.E19 Manufacturer Info Fields Checks

PASS

23

TD.PD.SRC3.E20

TD.PD.SRC3.E20 Manufacturer Info Fields Checks Invalid Manufacturer Info Target

FAIL

24

TD.PD.SRC3.E21

TD.PD.SRC3.E21 Manufacturer Info Fields Checks Invalid Manufacturer Info Ref

FAIL

26

TD.PD.SRC3.E23

TD.PD.SRC3.E23 Vconn Swap

PASS

27

TD.PD.SRC3.E24

TD.PD.SRC3.E24 Unexpected Message Received in Ready State

PASS

28

TD.PD.SRC3.E25

TD.PD.SRC3.E25 Receiving chunked extended message

PASS

29

TD.PD.SRC3.E26

TD.PD.SRC3.E26 Soft Reset sent regardless of Rp value

PASS

35

TD.PD.SRC3.E32

TD.PD.SRC3.E32 ChunkSenderResponseTimer Timeout

PASS

36

TD.PD.SRC3.E33

TD.PD.SRC3.E33 Country Codes Sent Timely

PASS

37

TD.PD.SRC3.E34

TD.PD.SRC3.E34 Country Codes Fields Checks

PASS

38

TD.PD.SRC3.E35

TD.PD.SRC3.E35 Country Info Sent Timely

PASS

39

TD.PD.SRC3.E36

TD.PD.SRC3.E36 Country Info Fields Checks

PASS

40

TD.PD.VDM3.E1

TD.PD.VDM3.E1 Fields Checks Discover Identity

FAIL

42

TD.PD.FRSISRC3.E3

TD.PD.FRSISRC3.E3 Accept Not Sent

PASS

43

TD.PD.FRSISRC3.E4

TD.PD.FRSISRC3.E4 PS_RDY Not Sent

PASS

44

TD.PD.FRSISRC3.E5

TD.PD.FRSISRC3.E5 PSSourceOnTimer Deadline

PASS

45

TD.PD.FRSISRC3.E6

TD.PD.FRSISRC3.E6 PSSourceOnTimer Timeout

PASS

47

TD.PD.FRSISNK3.E2

TD.PD.FRSISNK3.E2 FR_Swap Not Sent

FAIL

48

TD.PD.FRSISNK3.E3

TD.PD.FRSISNK3.E3 SenderResponseTimer Times Out

FAIL

57

TD.PD.VNDI3.E7

TD.PD.VNDI3.E7 Security Msgs Supported

FAIL

PD2 Deterministic Tests - Test Result Summary

Sl No

Test ID

Test Name

Test Result

1

TD.PD.LL.E1

TD.PD.LL.E1 GoodCrc Timing

FAIL

2

TD.PD.LL.E2

TD.PD.LL.E2 Retransmission

PASS

3

TD.PD.LL.E3

TD.PD.LL.E3 Soft Reset Usage

PASS

4

TD.PD.LL.E4

TD.PD.LL.E4 Hard Reset Usage

PASS

5

TD.PD.LL.E5

TD.PD.LL.E5 Soft Reset

PASS

6

TD.PD.SRC.E1

TD.PD.SRC.E1 Source Capabilities sent timely

PASS

7

TD.PD_SRC.E2

TD.PD_SRC.E2 Source Capabilities Fields Checks

PASS

8

TD.PD.SRC.E3

TD.PD.SRC.E3 SourceCapabilityTimer Timeout

PASS

9

TD.PD.SRC.E4

TD.PD.SRC.E4 SenderResponseTimer Deadline Request

PASS

10

TD.PD.SRC.E5

TD.PD.SRC.E5 SenderResponseTimer Timeout Request

PASS

11

TD.PD.SRC.E6

TD.PD.SRC.E6 PSHardResetTimer Timeout

FAIL

12

TD.PD.SRC.E7

TD.PD.SRC.E7 Accept sent timely

PASS

13

TD.PD.SRC.E8

TD.PD.SRC.E8 Accept Fields Checks

PASS

14

TD.PD.SRC.E9

TD.PD.SRC.E9 PS RDY sent timely

PASS

15

TD.PD.SRC.E10

TD.PD.SRC.E10 PS RDY Fields Checks

PASS

16

TD.PD.SRC.E11

TD.PD.SRC.E11 Accept Requests can be met

PASS

17

TD.PD.SRC.E12

TD.PD.SRC.E12 Reject Requests cannot be met

PASS

18

TD.PD.SRC.E13

TD.PD.SRC.E13 Reject Request Invalid Object Position

PASS

19

TD.PD.SRC.E14

TD.PD.SRC.E14 Atomic Message Sequence

PASS

20

TD.PD.SRC.E15

TD.PD.SRC.E15 Give Source Cap

PASS

21

TD.PD.SRC.E16

TD.PD.SRC.E16 PDO Transition

PASS

22

TD.PD.PC.E2

TD.PD.PC.E2 PS RDY Sent Timely

PASS

23

TD.PD.PC.E3

TD.PD.PC.E3 PSSourceOnTimer Deadline

PASS

25

TD.PD.PC.E5

TD.PD.PC.E5 tSwapSinkReady Check

PASS

27

TD.PD.VDMD.E1

TD.PD.VDMD.E1 tVDMSenderResponse Deadline Discover Identity

PASS

28

TD.PD.VDMD.E2

TD.PD.VDMD.E2 tVDMSenderResponse Timeout Discover Identity

PASS

29

TD.PD.VDMD.E3

TD.PD.VDMD.E3 Incorrect Fields Discover Identity

PASS

30

TD.PD.VDMD.E4

TD.PD.VDMD.E4 Applicability

PASS

33

TD.PD.PHY.E1

TD.PD.PHY.E1 BIST Test Data

PASS

36

TD.PD.PHY.E4

TD.PD.PHY.E4 Transmitter Bit Rate and Bit Rate Drift

PASS

37

TD.PD.PHY.E5

TD.PD.PHY.E5 Transmitter Collision Avoidance

PASS

38

TD.PD.PHY.E6

TD.PD.PHY.E6 Receiver Swing Tolerance

PASS

39

TD.PD.PHY.E7

TD.PD.PHY.E7 Receiver Bit Rate Tolerance

PASS

40

TD.PD.PHY.E8

TD.PD.PHY.E8 Receiver Bit Rate Deviation Tolerance

PASS

41

TD.PD.PHY.E9

TD.PD.PHY.E9 Valid SOP Framing

PASS

42

TD.PD.PHY.E10

TD.PD.PHY.E10 Invalid SOP Framing

PASS

43

TD.PD.PHY.E11

TD.PD.PHY.E11 Valid SOP P Framing

PASS

44

TD.PD.PHY.E12

TD.PD.PHY.E12 Invalid SOP P Framing

PASS

45

TD.PD.PHY.E13

TD.PD.PHY.E13 Valid SOP PP Framing

PASS

46

TD.PD.PHY.E14

TD.PD.PHY.E14 Invalid SOP PP Framing

PASS

47

TD.PD.PHY.E15

TD.PD.PHY.E15 SOP P_Debug SOP PP Debug Framing

PASS

48

TD.PD.PHY.E16

TD.PD.PHY.E16 Valid Hard Reset Framing

PASS

50

TD.PD.PHY.E18

TD.PD.PHY.E18 Valid Cable Reset Framing

PASS

51

TD.PD.PHY.E19

TD.PD.PHY.E19 Invalid Cable Reset Framing

PASS

52

TD.PD.PHY.E20

TD.PD.PHY.E20 EOP Framing

PASS

53

TD.PD.PHY.E21

TD.PD.PHY.E21 Preamble

PASS

USB-C Functional Tests - Test Result Summary

Sl No

Test ID

Test Name

Test Result

2

TD.4.2.1

TD.4.2.1 Source Connect Sink Test

FAIL

3

TD.4.2.2

TD.4.2.2 Source Connect SNKAS Test

FAIL

7

TD.4.2.6

TD.4.2.6 Source Connect Audio Accessory

PASS

8

TD.4.2.7

TD.4.2.7 Source Connect Debug Accessory

PASS

PD2 Communication Engine Tests - Test Result Summary

Sl No

Test ID

Test Name

Test Result

1

TDA.2.1.1.1

TDA.2.1.1.1 BMC PHY TX EYE

PASS

2

TDA.2.1.1.2

TDA.2.1.1.2 BMC PHY TX BIT

PASS

3

TDA.2.1.2.2

TDA.2.1.2.2 BMC PHY RX INT REJ

PASS

4

TDA.2.1.2.1

TDA.2.1.2.1 BMC PHY RX BUSIDL

PASS

5

TDA.2.1.3.1

TDA.2.1.3.1 BMC PHY TERM

PASS

6

TDA.2.1.3.2

TDA.2.1.3.2 BMC PHY MSG

FAIL

7

TDA.2.2.1

TDA.2.2.1 BMC PROT SEQ GETCAPS

PASS

8

TDA.2.2.2.1

TDA.2.2.2.1 BMC PROT SEQ CHKCAB P PC

PASS

9

TDA.2.2.2.2

TDA.2.2.2.2 BMC PROT SEQ CHKCAP NOMARK P PC

PASS

13

TDA.2.2.7

TDA.2.2.7 BMC PROT BIST NOT 5V SRC

PASS

15

TDA.2.2.9

TDA.2.2.9 BMC PROT GSC REC

PASS

16

TDA.2.3.1.1

TDA.2.3.1.1 POW SRC LOAD P PC

FAIL

17

TDA.2.3.2.1

TDA.2.3.2.1 POW SRC TRANS P PC

PASS

18

TDA.2.3.3.2

TDA.2.3.3.2 POW SNK TRANS PC

PASS

DisplayPort Alternate Mode Tests - Test Result Summary

Sl No

Test ID

Test Name

Test Result

6

TC.10.3.1

TC.10.3.1 Discover SVIDs ACK DP SID in Arbitrary Locations

PASS

7

TC.10.3.2

TC.10.3.2 Cable Determination

PASS

8

TC.10.3.3

TC.10.3.3 Enter Mode Sequence Fails ACK Response Not Sent

PASS

9

TC.10.3.4

TC.10.3.4 Enter Mode Sequence Fails NACK Response

PASS

10

TC.10.3.5

TC.10.3.5 DisplayPort Not Connected At UFP U Then Connected

PASS

11

TC.10.3.6

TC.10.3.6 Status Update

PASS

13

TC.10.3.8

TC.10.3.8 DP Mode Not Compatible

PASS

14

TC.10.3.9

TC.10.3.9 Displayport Configure

FAIL

15

TC.10.3.11

TC.10.3.11 Proper Pin Assignment Selection for DFP_U DFP_D Connected To Receptacle

FAIL

16

TC.10.3.12

TC.10.3.12 Proper Pin Assignment Selection for DFP_U DFP_D Connected To Plug

FAIL

17

TC.10.3.12

TC.10.3.12 tFirstSourceCap tTypeCSrcCapMeasurements

PASS

23

TC.11.2.1

TC.11.2.1 VBUS VCONN Before Attach Detection

PASS

24

TC.11.2.2

TC.11.2.2 DFP VBUS VCONN after Attach Detection

PASS

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