Fake 750Ti

[multiflexi]

I recently flashed fake 750Ti. I would like to share how I did it. Pics and rom will follow.

[rigred]

You say that the GPU after flashing only has 768Mb? Yet it has 8 2GBit RAM Chips? That means that it should have 2 Gbytes of VRAM not 768Mb AM I understanding this correctly?

If so this means that the VRAM configuration of the BIOS you flashed is horribly wrong.

[rigred]

I have a lot of details that I want to add. The most important being about how to select an appropriate GPU BIOS that matches the hardware, RAM config, timings and display outputs.

A lot of people have been contacting me about it and it's the trickiest part with GPU flashing.

I just wish I wasn't always tasked with other things so I had a lengthy bit of time to devote to this.

I will have a look at how I can merge your information.

[multiflexi]

I will take pictures of PCB tomorrow. How should I share them with you?

[rigred]

Simply attach them to the issue as file attachments. That would be the easiest, can pretty much just drag the file into the textbox.

[multiflexi]

roms.zip

[rigred]

Ok Nice. I cant quite see the RAM markings fully. They are certainly 2Gbit 64Mx32 chips. So in total the card should have 2Gbyte of VRAM as a lot of GTX550Ti's where configured.

Would you mind telling me which variant of this RAM you have?

Speed	Model Number	Pinout	Bank	Voltage
7.0Gbps	H5GQ2H24AFR-R2C	FBGA(170ball)	16Bank	1.6V/1.6V
6.0Gbps	H5GQ2H24AFR-R0C	FBGA(170ball)	16Bank	1.5V/1.5V
5.0Gbps	H5GQ2H24AFR-T2C	FBGA(170ball)	16Bank	1.5V/1.5V

I'm assuming they are the T2C?

[rigred]

Also run lspci with a few extra flags:

sudo lspci -vvv -knn -s 02:00

This should dump more lspci info.

Then if you can get yourself this repo:

https://github.com/envytools/envytools

Build it according to the instructions

And then run the nvbios tool against the original bios on your machine. It should produce a large output that you can dump into a text file.

Then run it against the bios you flashed aswel.

[multiflexi]

Yes, T2C. Here is the lspci dump:

01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF116 [GeForce GTX 550 Ti] [10de:1244] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. [MSI] GF116 [GeForce GTX 550 Ti] [1462:809d] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 125 Region 0: Memory at da000000 (32-bit, non-prefetchable) [size=32M] Region 1: Memory at c0000000 (64-bit, prefetchable) [size=128M] Region 3: Memory at c8000000 (64-bit, prefetchable) [size=64M] Region 5: I/O ports at e000 [size=128] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [60] Power Management version 3 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+ Address: 00000000fee40004 Data: 4022 Capabilities: [78] Express (v2) Endpoint, MSI 00 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1 <64us ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 75.000W DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop- MaxPayload 128 bytes, MaxReadReq 512 bytes DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend- LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <256ns, L1 <4us ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp- LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+ ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR-, OBFF Not Supported DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis- Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS- Compliance De-emphasis: -6dB LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1- EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest- Capabilities: [b4] Vendor Specific Information: Len=14 > Capabilities: [100 v1] Virtual Channel Caps: LPEVC=0 RefClk=100ns PATEntryBits=1 Arb: Fixed- WRR32- WRR64- WRR128- Ctrl: ArbSelect=Fixed Status: InProgress- VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans- Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256- Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff Status: NegoPending- InProgress- Capabilities: [128 v1] Power Budgeting > Capabilities: [600 v1] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?> Kernel driver in use: nvidia Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

01:00.1 Audio device [0403]: NVIDIA Corporation GF116 High Definition Audio Controller [10de:0bee] (rev a1) Subsystem: Micro-Star International Co., Ltd. [MSI] GF116 High Definition Audio Controller [1462:809d] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin B routed to IRQ 17 Region 0: Memory at dc080000 (32-bit, non-prefetchable) [size=16K] Capabilities: [60] Power Management version 3 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Address: 0000000000000000 Data: 0000 Capabilities: [78] Express (v2) Endpoint, MSI 00 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1 <64us ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 75.000W DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+ MaxPayload 128 bytes, MaxReadReq 512 bytes DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend- LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <256ns, L1 <4us ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp- LnkCtl: ASPM L0s L1 Enabled; RCB 128 bytes Disabled- CommClk+ ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR-, OBFF Not Supported DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1- EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest- Kernel driver in use: snd_hda_intel Kernel modules: snd_hda_intel

And output from nvbios

fakerom.zip

550tirom.txt