It is genetically illiterate to demand just one gene, as there are theoretically thousands of them, and dozens of them have been discovered. Asking for just one of them is an easy request to fulfill. Allele C of SNP rs10457441 has a 53.3% frequency among Europeans and a 19.5% frequency among Africans, according to "A review of intelligence GWAS hits: Their relationship to country IQ and the issue of spatial autocorrelation." The frequency data is sourced from the 1000 Genomes Project Browser. The allele would explain a small portion of the within-group variance in IQ, per the article by Davies et al. (2015), titled, "Genetic contributions to variation in general cognitive function: a meta-analysis of genome-wide association studies in the CHARGE consortium (N = 53949)." If you like, I can hunt down the amount of variance in the supplementary information of that study (it would be less than 1%, I expect).
You have merely shown a gene that varies according to race.
You have forgotten the most important part.
Demonstrating this gene has anything to do with "intelligence", whatever that is.
What does the gene specifically do and how is this related to "intelligence"?
Of course if you look hard enough you will find genetic variation.
And thinking merely showing a genetic variation demonstrates something does in itself demonstrate something.