Nvidia RTX 5090: Missing ROPs and FPS Drop in 4K - Diagnosis

⚠️ SAFETY WARNING / ELECTROSTATIC AND THERMAL RISK. Handling sensitive hardware components like the Nvidia RTX 5090 requires extreme caution. Before touching the card, ensure the power supply is disconnected from the mains and discharge body static electricity (using an anti-static wrist strap or touching a grounded metal part) to avoid damaging integrated circuits. Additionally, wait for the heatsink to cool completely to prevent burns. ReeFix provides this diagnosis EXCLUSIVELY for educational and informational purposes.

CAUSE A: Physical defect of the GB202 silicon (Production anomaly / Incorrect binning)

Probability: 95%

This is the real cause officially confirmed by Nvidia (defined as "production anomaly"). During the manufacturing process of the GB202 chip, a ROP partition (equal to 8 ROP units) was erroneously deactivated or cut off via logical fuses (fusing). This issue affects approximately 0.5% of the first production batches of RTX 5090, 5090D, 5080, and 5070 Ti. It cannot be resolved through software updates, drivers, or vBIOS flashes, as the block is permanent at the physical silicon level.

• Key Signals/Indicators:

  • GPU-Z consistently reports 168 ROPs instead of the 176 specified by official specifications.
  • The FPS drop is evident and measurable (approximately 4-5% less) only in high-resolution scenarios (4K, 8K) and heavy loads (ray tracing), where ROPs are a limiting factor.
  • The card operates stably without crashes, but with lower performance compared to reference benchmarks.
  • The issue has been observed on both Founders Edition models and custom variants from AIB partners (such as the Zotac Solid non-OC series).

• Quick checks (for expert user or technician):

  1. Run the latest version of GPU-Z and verify the number of ROPs displayed.
  2. Perform a pixel fillrate test (e.g., 3DMark or CUDA utility) to quantify the performance drop in intensive scenarios.

• Costs: €0 for the user. As this is a recognized manufacturing defect, the card must be replaced free of charge through the RMA (warranty) procedure managed by the manufacturer.

CAUSE B: Software reading error or outdated GPU-Z version

Probability: 5%

A diagnostic software reading bug or the use of an outdated GPU-Z version might not correctly recognize the Blackwell architecture, showing an incorrect number of ROPs and generating a false alarm.

• Key Signals/Indicators:

  • GPU-Z shows an incorrect number of ROPs, but 4K benchmark performance is perfectly in line with the official RTX 5090 specifications.
  • Updating the software restores the correct value of 176 ROPs.

• Quick checks:

  1. Update GPU-Z to the latest available version.
  2. Perform a clean uninstallation of Nvidia video drivers using DDU (Display Driver Uninstaller) and reinstall the latest drivers.

• Costs: €0 (self-resolved software issue).

WHICH ONE IS YOURS?

Considering the probabilities:

1. Verify with updated GPU-Z: Download the latest version of GPU-Z to rule out software reading errors. If the report shows 176 ROPs, your card is intact. If it consistently shows 168 ROPs, you are facing the actual hardware defect.
2. Initiate the RMA procedure: Since this is a physical silicon anomaly (GB202) not resolvable via software or vBIOS, do not attempt self-repairs or risky flashes. Immediately contact the customer support of your RTX 5090 manufacturer (Zotac, ASUS, MSI, Gigabyte, etc.) or the retailer to request a free warranty replacement.

Operational decision: If GPU-Z checks confirm the presence of only 168 ROPs, the only correct and safe action is to initiate the RMA process with the manufacturer to obtain a replacement card that complies with official specifications.

Tools and Spare Parts for the Technician

For advanced diagnosis and stability verification in the lab, a professional technician might use:

• Corsair HX1500i ATX 3.0 PC Power Supply (essential for testing GPU stability under maximum load).
• Fluke 179 Digital Multimeter (to verify correct voltage delivery on PCIe lines and power connector).
• CH341A EEPROM Programmer (used in labs for vBIOS chip reading, although the ROP anomaly is irreversible hardware in nature).

This inexpensive programmer is the last resort to restore a video card's BIOS using SOIC8 clip when software flash fails, leaving the GPU with a black screen and fans at maximum.

• High-performance thermal paste (for eventual reassembly of the cooling system during laboratory tests).

Output for Technician

You can copy and send this text to the manufacturer's technical support or the retailer to describe the problem professionally:

Subject: Detection of incomplete ROPs (168 instead of 176) on Nvidia RTX 5090 (GB202) GPU - Warranty replacement request (RMA).

An RMA request is being made for the Nvidia GeForce RTX 5090 graphics card in my possession. The GPU-Z diagnostic utility highlights the active presence of only 168 ROPs, compared to the 176 specifications of the reference model.

As Nvidia has now confirmed that this defect is due to a physical production anomaly (incorrect silicon binning/fusing on the GB202 chip), replacement of the product with a unit compliant with official specifications is requested. A screenshot of GPU-Z and comparative benchmark results are attached.