Well GRE only boosts to 2.3GHz. So if reports are true that the 9070 clocks up to 3GHz, then that's already 30% faster clocks. (5120 cores vs 4096 is 25% difference).
Also, in TPU relative performance, the GRE is 78% faster than the RX 7600XT (2048 cores - max clocks at 2.75GHz) as shown below:
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If we assume that the 9070 simply doubles the resources, cores/ROPs/cache etc of the 7600XT, and RDNA4 has slightly higher IPC, while running at 3GHz. The card should perform at least 200% faster than the RX 7600XT which makes it perform closer to the RTX 4070 TI Super and even RX 7900XT:
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This is how I believe the card may perform, at least at 1080p and 1440p and fall behind at 4K.