Gigabyte Geforce GTX 1070 G1 Gaming 2-Way SLI Review

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Posted by Heath Coop on Wednesday, July 13, 2016 - 8:00am

Gigabyte GeForce GTX 1070 G1 Gaming SLI

Introduction

If you read our review of the Gigabyte GeForce GTX G1 Gaming review a couple of days ago, you know we were pretty impressed. We were not done though, because we have managed to score two of these beauties. So what do you do with two GTX 1070’s? Well you SLI them.

What we wanted to know is exactly what kind of performance would two of these already very fast have. We already know that the GTX 1070 is capable of handling 1080 and 1440 resolution pretty well, but it can struggle under 4K. Will adding a second card alleviate that? Well that is what we are here to find out.

Multi-card SLI (Nvidia) and Crossfire (AMD) are known to have a few issues. First, support for multi-cards setups is up to the game designer, so there is no guarantee that it will give you a massive bump in performance, if any bump at all. Second, it just plain might not work at all, as some games crash, blue-screen, and/or can lock up.

Most of this review will be a recap of the single card review for those who have not had a chance to read it. If you have read the single card review, you can probably just skip to the meaty parts. Either way, we hope you enjoy it.

The Gigabyte GTX 10X G1 Gaming cards are not reference cards, though the design is simi-lar on the PCB level. Sure Gigabyte could have just replaced the cooler and called it a day, but that is not the G1 Gaming way. First off, PCB has been redesigned. They replaced the 5+1 phase power design of the reference card with a much more stout 6+2 design. This should improve stability when the card is overclocked to the edge and lessen temperatures somewhat.

Next up Gigabyte added a customizable RGB LED lighting system. A total of 16.8M can be mixed and there are numerous effects. Gigabyte’s own XTREME Engine Utility controls the lighting, plus there’s handy overclocking and fan controls included.

All of this is polished off with Gigabyte’s very own Windforce 3X cooler. The Windforce 3X cooler features three fans with a unique blade. It is designed to run silent at lower temperatures by stopping those fans, which is indicated by a LED lit “Fan Stop” logo. There is also composite heat-pipes that promise superior performance. 

A Bit About Pascal

Pascal is a direct evolution of Maxwell, but it is manufactured on a new 16nm process versus the 28nm process that was used with both Maxwell and Kepler. Like the rest of the GTX 100 series, the GTX 1070 is a bit different from the GTX 970 it replaces. The raster operations pipelines count has been increased to 64, from 56. The texture mapping units have been increased from 104 to 150. The new card features 8GB of GDDR5 VRAM versus 4GB GDDR5 VRAM. The CUDA core count is now 1920 versus 1664. All of this while having power requirements that are far lower than the previous card.

New features in GP10x:

  • CUDA Compute Capability 6.0(GP100 only), 6.1(GP104)
  • DisplayPort 1.4
  • HDMI 2.0b
  • Fourth generation Delta Color Compression
  • Half precision FP16 operations executed at twice the rate of FP32 (GP100 only), while FP64 operations run at 1/2(GP100 only) or 1/32 the speed respectively[6]
  • PureVideo Feature Set G hardware video decoding HEVC Main10(10bit), Main12(12bit) & VP9 hardware decoding(GM200 & GM204 did not support HEVC Main10/Main12 & VP9 hardware decoding)[7]
  • HDCP 2.2 support for 4K DRM protected content playback & streaming(Maxwell GM200 & GM204 lack HDCP 2.2 support, GM206 supports HDCP 2.2)[8]
  • NVENC HEVC Main10 10bit hardware encoding
  • GPU Boost 3.0
  • Simultaneous Multi-Projection
  • HB SLI Bridge Technology
  • New memory controller with GDDR5X & GDDR5 support
  GTX 1080 GTX 1070 GTX Titan X  GTX 980 Ti GTX 980
GPU GP104-400-A1 GP104-200-A1 GM200 GM200 GM204
Architecture Pascal Pascal Maxwell Maxwell Maxwell
Transistor count 7.2 Billion 7.2 Billion 8 Billion 8 Billion 5.2 Billion
Fabrication Node TSMC 16 nm TSMC 16 nm TSMC 28 nm TSMC 28 nm TSMC 28 nm
CUDA Cores 2,560 1,920 3,072 2,816 2,048
SMMs / SMXs 20 15 24 22 16
ROPs 64 64 96 96 64
GPU Clock Core 1,607 MHz 1,506 MHz 1,002 MHz 1,002 MHz 1,127 MHz
GPU Boost clock 1,733 MHz 1,683 MHz 1,076 MHz 1,076 MHz 1,216 MHz
Memory Clock 1,250 MHz 2,000 MHz 1,753 MHz 1,753 MHz 1,753 MHz
Memory Size 8 GB 8 GB 12 GB 6 GB 4 GB
Memory Bus 256-bit 256-bit 384-bit 384-bit 256-bit
Memory Bandwidth 320 GB/s 256 GB/s 337 GB/s 337 GB/s 224 GB/s
FP Performance 9.0 TFLOPS 6.45 TFLOPS 7.0 TFLOPS  6.4 TFLOPS  4.61 TFLOPS
GPU Thermal Threshold 94 Degrees C 94 Degrees C 91 Degrees C 91 Degrees C 95 Degrees C
TDP 180 Watts 150 Watts 250 Watts 250 Watts 165 Watts
Launch MSRP $599/$699 $379/$449 $999 $699 $549

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